Scroll down to find "Create a new game server account". CS:GO uses App ID 730, so go ahead and fill in the textbox next to App ID. Add a memo so if you ever need it again in the future, you can easily find it.
You have now generated a token, it should look something like this. 359D9F46FCCA5DE795489F9859XXXXXX
Copy the token, and log in to your i3D control panel, find your CS:GO game server and click on config editor. The very top textbox is named "startup command line".
Add "+sv_setsteamaccount <your token>" to your startup command line. Make sure to have a space in between what you are adding now, and the last startup command that was already in startup command line. The command you're adding should look like this: +sv_setsteamaccount 359D9F46FCCA5DE795489F9859XXXXXX
Click "Save startup line" and restart your server. Your problem should be solved.
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