I dont quite understand, how would I do that?

Tried that, also deleted the save file, but the cargo mods wont take effect.

I changed cargo space to 500, saved the file in /extensions/ and started the game. I opened the menu with S, but the cargo was 49, one ton for fuel, the cargo changes just wont take effect.

I dont know if im just not editing the right file or something, but im having trouble boosting the cargo capacity of any of the starter ships. I believe my mods to the limit on devices worked, but not the cargo parts. Ive got other mods loaded and running fine, and im using the PlayerShip.xml.