I have a colleague wishing to transfer from another university into Mac for the summer term. Does anyone know how they would go about doing that? Like a form or application, or should I just go to the Registrar and ask for them?

It's best to contact the Registrar's office directly, although I'm not too sure if a transfer during the summer is possible this late in the term to be honest :/

you need to do letter of permission for the summer