Two peplink balance 210 - remote desktop - how configure

Hi, i’m new and i’m not very expert about this product. I have this problem. i have two office and i have the necessity to connect one office to the server on the second office where’s a software that i need to use in remote.
Wich kind of configuration i need for the balance 210 ? I activate the remote desktop on the server where i need to connect but from the other office i received the message that the remote desktop isn’t active,
please help me