registration options

I recently migrated from VB and have a registration form that I would like to make a small change to, so I have a couple of questions. My current registration form has a required field called "Location (city, state)", as seen in attached image. Right below that I ask what British cars they...

I have spent a lot of time searching for all the various options for registration in the xenForo manual, but can find precious little. There is a default profile field for Occupation, but apparently it is not editable, nor is it an option to make this field required during registration. I would...