On the sidebar to the right there will be a Credits category in the Inventory section - click the amount of credits you have there. This will take you to a new page where you can input the receivers name, how much you are sending, and a message to attatch to it (ie to tell them whats it for). Then hit send and its done.
Please don't edit your titles. It prevents someone with the same question from coming along behind you, seeing your thread, and getting the answer without having to post and wait.
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"May the Grace of Ara go with you, and His Vengeance be wrought upon your enemies."