Ok make your menu's big so they dont stretch to fit the screen then puth them in Documents FPSC x10 Files assets, and open the game editor then in the file-build game menu-level settings tab-title screen you will find the backgroung location and browser to locate your backgrounds---I like to make a folder in assets and copy it to the programfiles directory of fpscreator and find the other copy of the assets directory so i dont have to click so many times to find my stuff- but not recommended unless your carful couse if a file gets moved in that dirrectory to the wrong place your editor wont work. Hope this helps--I know peaple who have died waiting for a moderator to respond-lol
GameCreator/Ninja