As he said, you don't need to change anything on the php file to make the profile from being displayed. However you will need to do some changes if you want to have SEO links in that profile page.
You need to specify a rewrite condition (RewriteCond) before you can specify a rule. I suggest you read up on mod_reqrite first.
Are you sure about that? Yours Truly, what happens when you try to use this? Also, the second rule will cancel out the first, since it can match 0 times.