You can't unless you were to hack, otherwise you would need to be on that account.
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Build mode is set up by opening Roblox Studio. When you get in, click the "New" button. This will make a new game where you can build.
You must build your place. push menu. Select Game mode then Studio. You Can find the model in "Worksapce". Then Drag and Drop it into Starter Pack. Hope This Helps! -- ROBLOX user ImaginaryNeo
You go to build mode, find yourself in workspace, copy everything, then paste.
There is, you just have to switch from supersafe mode to safe mode on "my roblox".
No, it is not possible for two people to be working on a single place at the same time unless the place is a group place. Group places are places owned by a Roblox group which can be edited by players of a certain rank in the group. Building in group places is slightly limited, as you cannot create scripts or pause the game while building in group places.