Inexperienced question - changing block colors

I want to change the color of the font  and the background in the block titles...I have looked for it in the forums, but don't know what they are called.. lol.  I have circled the things I want to change in the uploaded pic.  can someone tell me either where to find how to do this, or give me a crash course please?

Go to templates>base>css>common.css and look for line 46 and change color: #333 to the color you require.

.boxFirstHeader{height:21px;padding:7px 0px 0px 10px;font-size:12px;color:#333;font-weight:bold;text-align:left;text-transform:capitalize;border-bottom:1px solid #CCC;position:relative;font-family:Verdana,Arial;}

Well, it didn't work and I cleaned the caches in deano's tools (thank you Deano).  I have a free template installed.  Would I have to change it in the template files?  Sorry, forgot to mention that in my first post...

Yes, in your template  css/common.css

if there is no declaration in your custom templates CSS for any given class or design element, then it defaults to templates/base

so changing it on the custom template is the first place, you would typically try to change it, because dolphin has the ability to load a template switcher, so editing base, would override any other template you may opt for in the future, or if you were to switch templates yourself, it would require that you edit all changes you made in /tempates/base/css

if you have no plans on changing the template, or using the template switcher, then editing /templates/base is ok, not what i would consider the best approach. 

OK, thank you... I really don't want to change the base template until I get a better hold on how to change the script.  I will try the template first... thanks

OK. Make the change in common.css as suggested before.

Then in /public_html/cache_public/

look for the following the following css and gz files. Make a backup copy of them somewhere of your choosing then delete those two original files located located in cache_public.

bx_templ_css_9226dcbb15db0872518063a4a64b3fb1.css

bx_templ_css_9226dcbb15db0872518063a4a64b3fb1.css.gz

That should change the colour for you.