Add a new server. Fill the fields with information about it
Now go to the "Schedule" section
Set the game start time
Optionally: if your server uses mods then add them to the list
You can also submit your own mod
You need Fwatch 1.16 and OFP Aspect Ratio pack 2.06. Download
Start the game with Fwatch. You'll see "Mods" button in the lower left corner. Click on it and then on the "Schedule" button. Select server from the list
Double-click on the server name to show available options. If you lack required mods then double-click on the "Download"
Wait for the installer to finish. Playing the game or even quitting it won't affect the installation.
Once it's done go to the server options again and double-click on the "Connect"
Have fun playing!