Fix our php site, then help us with some wordpress task.

Firstly, we have an issue with the mysql/php of our site, for some reason when users edit details it messes up the ability to login and causes some problems. I think there is an error on the edit details page. Secondly. we need some help eding 2 wordpress sites, content updates, nothing complex. Please include ABC in your reply so I know you took the time to read this. Thanks you.