How Do You Properly Move the default spawn point?

I want to move the spawn point for my map and each time I move it and save it it reverts back to the original place. Is there a file I need to change or something? The default spawn point doesn't even show up on the .mis file because i believe I tried to delete it once. I have tried making another spawn ect. Just need some knowledge about the spawn points and what camera bookmarks are.

Thanks!