To connect use the Remote Desktop Connection Tool, Once opened enter the IP/Name provided in the email into the Host/Computer field and click connect, after that you will be asked for login credentials, enter them and you will be connected.
Windows Vista / 7 :
Click Start, point to All Programs, point to Accessories, and then click Remote Desktop Connection.
For XP :
Click Start, point to All Programs, point to Accessories, point to Communications, and then click Remote Desktop Connection.
XP users must install this update
Mac OSX :
Download and install this software