You should be able to click on the 'Control Panel' link, found on the left side of the page, under the 'Ask a Question' button. Then, click on 'Edit Your Details', under the 'Your Profile' link.
If this doesn't work for you, post the problem you're experiencing in Tomísimo's (David's) profile comments and he'll be able to help figure out what's wrong.

I cannot find how to edit my profile everything I tried just brings me back to what already have that is just my name I want to Put age height etc trabhoe etc how do I change content can you help