1 Download STM64.z64 (link is in Super Textured Mario 64 project)
2 Go to qubedstudios.rustedlogic.net/ToadsTool64Betav05994b.zip
3 Extract the .ZIP file
4 Open STM64.z64
5 Once you have added your own textures a bit (don't change the already changed textures), put the download link to the edited game in the comments.