An invite will be sent in an email to create an account for Dameware. If the invite has expired, you can select the "Forgot password" on the login screen to finalize the account creation.
After creating an account, you'll want to do the following things before starting remote sessions:
Click on "Downloads" in the left sidebar
Download and install the "Technician Console"
The Technician Console is required for connecting to remote sessions, though starting sessions can be done from the console in the browser as well.
If you're not prompted to turn on two factor authentication when logging in, it can be enabled with these steps:
Click on your name in the top right corner
Click on "Two Factor Authentication" in the menu
Follow the prompts