Hey. I have recently downloaded a world save for Minecraft Xbox 360 and imported it into Horizon, and it did not ask me what gamertag to use, (I am very new to horizon and a bit of a derp at it, but how do I open content manager?!)
You can drag the save into the Horizon and it will open Package Manager then you can edit what you want in the save, there …
Open Horizon
Drag the save you want to edit onto Horizon.
Plug in Usb…
There are two ways to put your information onto another save:
1. Manually:
Go drag out another save (which came from your Xbox) and the save you want to put onto your Xbox.
Then copy and paste the in the ID’s from the one from your Xbox to the new save.
After you are done, don’t forget to click Save Rehash and Resign and save it onto your USB stick.
2. Automatically
If you have your Profile on your USB stick,
Click on the ‘Change’ button below the profile and click on the profile you want it to be saved onto.
After you are done, don’t forget to click Save Rehash and Resign and save it onto your USB stick.