First find your Admin Password → Game panel → Configuration files → cstrike\cfg\server.cfg → Rcon_password
Then turn on your console in game → Options → Advanced → Enabled developer console.
Join your server
Open the console by pressing the tile key (` key to the left of 1 on most keyboards)
Type: rcon_password youradminpasswordhere, and press enter
Now you have access to server side commands, Rcon must be written before any command and a list of commands can be obtained here
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