If you want to show your appreciation to a fellow player, or help out a friend, you can purchase chips and have them directly deposited into a friends account. To do so, click the Buy for a Friend button on the Get Chips page and start typing your friend's name to select them.
Enter your friend's username in the pop-up box that appears:
Then, once your friend is selected, you just choose your payment option and click the "Buy Now" button:
And that's it! Your friend will receive a notification once the chips are deposited, letting them know that you sent them a gift.