How to put together .TGAs...?

as the title suggests. I've got a lower, head, and upper .tga file for a custom skin. How do I throw them all together to have a working skin as whole, instead of three texture floating around?

Right click a folder in your inventory and select new/body parts/skin. This will create a skin object named "new skin." Double click that skin to wear it on your avatar, then go into appearance mode (right click your avatar and select "appearance" from the pie menu). In the appearance editor, go to the skin tab. To the left of the thumbnail images, in the margin, you'll see a stack of three empty squares which are texture slots for head, upper body, and lower body tattoos. Drag and drop your skin textures into the appropriate boxes, then save the skin.