Help please!!!!!
 

I need help to know how to change colors of user groups.

Also i want to know how to make guests not able to go to profiles and stuff.

These options are all in your ACP > Usergroups > Usergroup Manager > Edit Usergroups

When you click on Edit Usergroup you'll find the options to define colours near the top of the page under Username HTML Markup
Blue is merely an example, you can use 40 basic colours by typing their name. You can also use html colour codes by using # followed by the six alphanumerics that define the colour. For example, if you wanted a particular group to be crimson & in bold text, you would type Do this for each usergroup you want to define a colour for.

A comprehensive list of html colour codes can be found here: http://www.w3schools.com/HTML/html_colornames.asp

Further help on setting up your usergroup permissions (and just about everything else) can be found in the vBulletin Manual here: http://www.vbulletin.com/docs/html/