Medicat is hosted off-site and is accessible only via the Microsoft Remote Desktop protocol. You should connect to Medicat using your Medicat username and the domain mct-saas. This looks like mct-saas\1342username
If you are using Windows (PC), you can download a link with the correct settings here: https://tcu.box.com/shared/static/pjh4s4xp37h7hr940n81cffwl3m91vl4.rdp
For Mac (Apple) users, follow the instructions here: RDP_Mac_2018