How do I add textures to Supertux?

[Tlaloc1]

So, I am trying to add some textures to Supertux (0.1.3). How do I make it so that the textures appear in the editor? I was hoping someone could help me, even though 0.1.3 is outdated.

[Hume2]

You edit the tiles/supertux.strf file. Is that the problem, or you have a concrete trouble with editing it? Note that the other *.strf files in 0.1.3 in the folder tiles don't do anything. You can even delete them and nothing happens. Yeah, just don't delete supertux.strf, this one is very useful.

[Tlaloc1]

Yeah, I was experimenting with the surf files, and found that they don't really do much if you delete them. So all I have to do is make a Sub-catagory, and put in the values/file names?

[Hume2]

Yes, you put in the IDs and then define those IDs bellow. There are already many IDs defined, so you do it a similar way as those.