I have a map I made and I want you to use it in MM but I don’t know how to summit it
Two words: You can’t
The hive doesn’t allowed maps to be submitted for bedrock edition due to copyright issues if I’m not mistaken, not sure exactly what the build team application is so I won’t put it here
As stated above, you cannot.
But you can apply to be part of Team Nectar (Hive’s official build team) here.
(: You must also be a HiveMC Java player to apply.)