When making a map in UEFN with my friend I need to know how to work with uefn toolset in the same map at the same time as my friend

If this is possible to help me with please reply

This Documentation post should answer most of your questions: Collaborating in Unreal Editor for Fortnite | Unreal Editor for Fortnite Documentation | Epic Developer Community

But essentially You need to both be 18+ and there’s 2 ways to collaborate, one being one host a Edit session and invites the other to join in with one doing stuff in UEFN and the other inside fortnite, or you both have your own UEFN instance and then “Check-In/Upload” your changes and have the other person download the changes.