Add players in-game to your steam friends list

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There's someone in the server and you would like to add them to your steam friends list, but you don't know how. Then follow the steps below to add them to your steam friends list.

When inside the game press and hold the SHIFT key and press the TAB button. The first thing you are going to see is your steam friends list on the right hand side and at the bottom you are going to see some buttons click on players and a window will open. In the current game tab you are going to see the names of all the players currently in the game. Cick on SteamID page of the player you want to add. After a new window will open called Steam Community In-Game on the right hand side of the page click on Add to your friends list and the player is going to receive your steam friends invite.