Add an existing website

We had a company, called Red Jacket West (RJW) develop a course site for us - courses.christinecarter.com. We have purchased complete rights of the system from RJW but they are no longer in business. I believe the WPMUDEV dashboard is pointing to one of the RJW engineers, but I have no idea how to verify that. I've signed up for a WPMUDEV account and would like to ensure that I have control over the system. We're seeing some inconsistencies that I need to have addressed.

Jumping ahead: the system is appending multiple /page*/ to the URL and I'd like to understand the root cause.

Can you 1) help ensure my site is assigned to me and 2) shed some light on the URL issue?