There are color schemes you can chose from in the Classipress admin settings. Likewise, setting up your logo can also be done in the admin.
If you need to edit some codes, wordpress admin has an included editor and so you can tinker with html, php, css codes in the admin section.
Please help our moderating team work more efficiently by not sending us support questions via PM. You can read more about how AppThemes support works
here. However, you can send a PM to follow up and remind me if I missed your support request/thread.
Thank you and have a nice day.