Bun venit pe GTA5-Mods.com

Friend, sorry for the inconvenience, can you please explain to me how I can edit the ymap please, I want to add more lighting to it but when I load it in codewalker, it appears to me as if it were practically empty.
I leave a video of how it appears within codewalker:
https://streamable.com/dg0tu3

Hey bro, could you make a tutorial to how edit textures, something like you did