Just go to https://anydesk.com go to download section and install on your computer.
After the installation, you will see one big number on the top, just inform this ID to the support person. With this they can connect to your computer and check everything remotelly.
Example of ID
If you have a MAC
If you install Anydesk on a mac, you need 2 additional steps, just open SYSTEM SETTINGS , go to PRIVACY & SECURITY