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Just rename the file exactly same like the rom (example - if your rom is XYZ.gba so your save will be called XYZ.sav) And put the file into the same directory as the ROM. I would recommend you (but it might not be necessary) to make a save file (like you start the game, you are in the house where you start and you save the game) before you put your modified save in. Sometimes game doesn't recognise the save file and replaces it by new one (VBA creates save files after the ROM is closed to prepare place or something like that). It happened to me once or twice, but I am saying, it's not necessary.