How do i load an unfinished custom map in the editor ?

Hi, i've been working on a custom map for an entire day and i don't remember how do i load it in the editor to finish the work. I kept the link of the game open but that didn't work and i can't find it in the "published maps" i already made (i need to delet them they are trash). I feel a bit dumb but i clearly need your help please

Anyway, i searched my name that found the map lol thanks, HF