The proper way to upload textures?...

[falcondelta]

I tried using directories that held textures and flats to add to my map, but when testing time came they were not included in the wad. So then I try to put them directly in the wad with XWE only to get an error message about missing textures/flats that could not be fixed. Can I undo that by removing the added textures? Also, what is the right way to add textures and flats? Thanks.

Edit: I'm guessing the lack of posts means I'm doing it the right way but it just won't work?