my terrain file isn't showing up in my game after i cojmpile and run it. I saved it as a .hmp and i added it as a terrain. any help!!!!

What version did you have? You must have minimum the extra edition of GS. Also there can be some limitations of the terrain size when you have an older version then 6.50.

I have version A6.50 commercial edition

Is your terrain file in the same folder as the main script. If not, it´s possible, that the engine can´t find it (unless you have a path-instruction, pointing to the folder).

had this the first time i used GS, you need to add a texture to the terrain, Edit > skins