To trade with other players, click on the player, then click on the name tag.

A menu will appear, select 'Player Trading'.

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Drag the items you wish to trade from your bag into the trade window.

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Press Ready to confirm the transaction. Your trade window will grow blue.

When both players are ready the transaction will be complete.

NOTE: Always double check if the items your trading (yourself and the other player) are correct before you confirm. Don't be Scammed!