Can't access wp-admin

I went into my wordpress settings and changed the site to point to http://www.domain.com/category/blog instead of just http://www.domain.com and now i cant access the admin side of my site.

I believe I will need to go into cPanel to fix this but I have no idea how I did this. If anyone can point me in the direction of an article that might be able to walk me through this I would appreciate it.

This is my site btw:
http://www.goodrichresidential.com

Thanks,

Dan