You can make a donation from the already purchased packages available in the "Donation Packs" section. At the bottom, there is a blue "Donate" button, once you press it, you will have the option to select a player to whom you want to send the donation. After selecting the person you want to donate to, click on their avatar picture, and you will go to their profile. There, you will see the section with donation packs, and on the available offers, you will have a blue "Donate" button or the option to purchase the offer you want to donate.

If you have already made a purchase but have not yet sent your donation, go to the player's profile and select one of the donation options. After pressing one of the "Donate Chips," "Donate VIP," or "Donate Gems" buttons, a window with the donation inventory will appear. On the already purchased package, you will see a blue "Donate" button - press it, and the donation will be automatically credited to your friend's profile.