Please note that if you add multiple builders, you cannot have the builders working on the same map in our mapmaker at the same time. If one person clicks the save button, it will override any concurrent map edits created by other map builders.
However you can have multiple people use our Build Mode at the same time when they are in the space.
If you get can an error saying another builder's email is not recognized, that means they have not created an account with gather yet. Please ask them to head to https://gather.town/app to sign up.