[SOLVED] Help!! parse error

So I (stupidly) was messing around trying to add an RSS thing at the bottom of my posts in the function-php section and even though I thought I erased everything I put in there, now I'm getting this error

Parse error: syntax error, unexpected '}' in /home/suzrock1/public_html/blog/wp-content/themes/atahualpa_o/functions.php on line 674

At first, I couldn't even get to the wp-admin to try to fix it, had my hoster change the file name, so now I can get into my wp-admin, but I have no idea how fix the php in that section.

The default WP theme is on my site now, and I'm afraid to activate the Atahualpa theme because I'm worried I'm not going to be able to go in and fix anything.

What do I do???