champooz:
For information with images, go to Help > ArchiCAD Help, when your browser opens click on the "Search" tab, and input "texture" in the search box, in the results list "Material Texture Panel" will show you screen shots, the other links will be helpful. You can also search this forum.
You should add a Signature to your Profile (click the Profile button near the top of this page) with your ArchiCAD version and operating system (see mine for an example) for more accurate help in this forum.
David