Log into RDS (Either through the Web Browser or using the Remote Desktop Application)
In the RDS Window, click on start menu and start typing in Remote Desktop
Select Remote Desktop Connection
Input the device you are trying to remote into
Enter your credentials credentials
You are now logged into the device and can use as if you were on that device.
Video to Login on using the web browser on Mac
https://video.syr.edu/media/t/1_kj5b1rtp