How to remove Join button from sub-menu?

I need to remove the "Join" button from the sub-menu (below the main menu). I have been trying to figure out where I can edit this menu, but no luck. Does anyone know where I can find and edit this menu? Thank you.

I found a workaround that seems to work to remove (or deactivate) the Join button. If any of you are having this same issue, check this forum post: http://www.boonex.com/forums/topic/How-to-get-rid-of-the-JOIN-button.htm  Go to the last post in the topic for updated details for use with Dolphin 7.1.x  Don't delete the text shown in red, instead just place the symbols highlighted in blue at the front and end of the text shown in red. Works fine! 

Thanks for the update, I was going to respond to your original post but noticed you had resolved the issue already. Good job!