At the request of our support engineers, download splashtop from the following link that corresponds to the operating system your machine runs.
For Windows machines
Launch the downloaded program. (It may be in your Downloads folder.)
Then, give the 9-digit number to your IT admin.
When you want to end the support session, be sure to quit the program.
This ensures your computer cannot be remotely accessed any more until you download and run the program again.