Forge Issue that has been haunting me for awhile

So, ive been having this forge issue for quite sometime now, i can see people making amazing maps, and stuff out of forge. when i start making my own, i found a problem, that is after saving and playing in the map, the issue that doesnt allow you to edit the maps come in, i get really frustrated by this… please fix 343i…

You can’t edit your own map after you’ve saved it? I can…?

My issue with Forge is that I see people making these great and amazing maps but when I go to forge and try all I can do is make turds. Plz fix 343.