Put in your computer name or IP address (which you should have received in an email) into the text box labeled PC name. Once you click Connect, you will be prompted to enter your credentials.

Although I first got interested in remote.it because I thought it could be used as a virtual private network (VPN) alternative (to hide my IP address to websites that I visit, for example), the ...

If you want to enable Remote Desktop Access with xrdp on Raspberry Pi to connect to it using any device of your choice, see this tutorial.