4. Click the arrow in the upper-right corner of the chat window and select Invite to Trade. You can also right-click someone's name in your Friends list and select Invite to Trade from the menu that appears. 1  You can also start a trade with people playing on your current server if you're playing the game.2  Open the Character menu by pressing M and then select Trading.ou can find lots of Groups dedicated to trading, whether it's all Steam items or specific to Team Fortress 2. 1  Hover over your username and select Groups. 2  Click the Browse groups button and type your search terms. 3  Browse through the related groups and join any public groups that seem interesting.