How To Make Visitors Registered To See Anything?

I want all the visitors to register before seeing anything on my site, please show me where to turn that feature on.

Thank you

I don't believe that is a feature of Dolphin.  However, you can include a guest redirect to a splash page with the join and login buttons.

There is a guest surf limit in the market, searching on Guest did not reveal anything else.

I don't know if changes have been made or not, this was for 7.0:

* Deanos Redirect Guests to splash.php - Code Add - Start */
/* NOTE: If this is a dolphin page that uses the dolphin template system then this */
/* may cause a loop. */
if ((int)$_COOKIE['memberID'] == 0) {
    if ($_page['header'] != 'Join') {
        header('Location: ' . BX_DOL_URL_ROOT . 'splash.php');
    }
}
/* Deanos Redirect Guests to splash.php - Code Add - End */

To use that you created a splash.php page for your site with the login and join buttons.

Thank you Geek Girl, that may not work for my purpose because I want the guests to see the thumbnails and the titles, descriptions etc on the frontpage, but as soon as they click on that to see the full content they'll be prompted to register. Same thing like most of the porn sites out there, where you see the very attractive picture, video but u need to register to see, and the content is a like a shade in the background.

Then what you want to do is to use the Page Access Control Module that ships with Dolphin to block the pages.  You also want to look at the settings for the blocks on each page; you can block access to the blocks using the guest/member settings.  Then you will need to change the message they see from the "Access Denied" to something that will inform them and provide a link to the join form; something along the lines of "You need to be a member and logged in to see this content.  If you are not yet a member, join our site to get full access to all content." and you provide the join button or a link to the join form.  For example, with PAC module, you can block access to the page to view the photo.  They will see the thumbnail, but when trying to view the photo, they will get the message you created shown to them.

Why not tease them with allowing them to go so far like maybe 4 pages then redirect them to registering.  It can be successful as long as they want or need what is on your site.  I think it is much easier than the first suggestion depending on how large your site is... 

There is a module in the market that will do this.  I think Scriptologist has it.  It is called surf limit and you can limit how much surfing your site that a guest visitor can do.  Not a very expensive module either.

I found it myself, and I want to post the instructions here just in case someone wants to do the same. No coding required.

You just need to go to admin control panel, click on Settings, click on Membership Levels. Then you choose the group non-members and click on ACTIONS to see what the guests/non-member can do. With my case, I select View Video and click Disable.  Now users can see all video but when they click on it to watch they're required to register ( you need to edit the lang key for Access Forbidden, I edited to something like "Please register/log in to watch this video" so the visitor knows what to do. 

You can use the same methods for anything, e.g you have a story site where you let them see the titles, descriptions etc (by bringing the story block to the frontpage), then when they click to read on they'll be asked to register. I'll be pissed but if I like that story so bad then I still have to register to read it. Once they're in you offer something nice to keep them coming back then you've accomplished your goal.

P.s I don't know if this has ever been done, or was done but they don't feel like to spew the ''secret''.

Yes, I forgot the membership levels, there are more than one way to approach things.