Please log into your thri.xxx account and go to the Chathouse 3D Webshop: Chathouse 3D Shop

Look for the item you want to give as a present, click on ‘Detail’ of the item and then on the button ‘Make a gift’
Now enter your friend’s exact username, add a message to her/him if you like and click on the button ‘Make a gift’ and your friend will get a notification about your present. You cannot gift the “remove censorship” upgrade.

Another option is to visit your friend’s profile page and find if she/he has a wishlist (you can find it on the right column). From there you can see her/his prefereed items and you can pick one or more and gift them simply by clicking on the giftbox icon and following the instructions.