changing post editor buttons

I am new. I want to change the post editor buttons so have downloaded the following plugins:
c editor plugin
TinyMCEadvanced plugin
WP super edit plugin I still cannot get my post editor buttons to change. I have cleared the cache many times and read forums posts but still cannot figure this out.

Is there some additional code I need to add? if so where do I add it?
Please go step by step
Thank you, Sandra