-Set up your app with itunes connect
-set up development certiciface on appledeveloper site
-set up development profile for your game bunlde
-IOS packaging.exe will create a request file for first time. Point is to download the .request file which hast to be selected when creating the certificat on the developer sit. After that you can download your certificate
In editor settings go to ios and after downloading your profile file and certificate file import those. It should say valid. Some people (including me) have issues with the provision profile not being valid even though it should be. Hope I could help at least a little