On Xbox one, I have a single player world I have put countless hours into, does anyone know how I can turn it into a realm?
First off, to do this, you have to buy Minecraft Realms. If you have already done that, hover over the world you would like to select, and click the pencil icon next to it. Here, you should see all the options. Right next to where it says Play/create, it should say something like "Make a Realm!". Click on that and it should work.