ruby on rails, lovdbyless fixes

Hey all, I have a few things that need to get done asap to my social network, there is a 500 error when logging in, I want to add a blog, a pro account system for users to buy an account with extra features and I would also like an about page and a store link added. this is is ror built on lovdbyless and I need some good english ror nerds who are quick, thanks!