You already know that using the iOS developer portal is the way to prepare your iOS game for release by building the provisioning profile, certificates, devices list, and the bundle ID. Now when the journey of creating a game comes to its end, you have to access what is called iTunes Connect.
By accessing https://itunesconnect.apple.com/, you'll have a dashboard that should be hosting your apps, games, charts, reviews, revenue, downloads, and everything related to your product in the post-production stages.
The most important part right now is My Apps, where you will be building the first profile for your first ready-to-go game. Because you are using ads, In-App Purchases (IAP), leaderboards, or achievements, you need to create a setup inside the game profile first. Then, you can keep developing inside Unreal Engine. Once you access the My Apps section, you'll find that it is mostly empty, so start adding a new app using the plus icon in the top-left corner, as you must have...