Web site frustration

So I decide today's the day to set up my web site. Aargh. I chose a template, but couldn't for the life of me figure out 1) how to change the titles of the buttons. IE, one says "About Us." There HAS to be a way to change the thing to About Me. And then I tried to upload my picture but the resolution or whatever must have been too high because it took up the whole page and I couldn't change THAT. At least I could figure out how to do this!