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Open Remove Ads (in the menu settings, or after a match) and tap Restore Purchases. Purchases are tied to the Apple Account that bought them, so make sure you are signed in with the same one.
Remove Ads is a one-time purchase, not a subscription, so there is nothing to cancel. It turns off the ads between matches, doubles the gold you earn in matches and unlocks the Voidchain hook. Refunds are handled by Apple at reportaproblem.apple.com.
Tap PLAY ONLINE on the menu. Quick match pairs you with players near your rating. Create a room to get a 4-letter code for friends, or send a Game Center invitation (sign in to Game Center in iOS Settings first). Empty seats are filled by bots, so a match always starts. If you cannot connect, check your internet connection and try again.
Progress is stored on your device. Deleting the app deletes your profile and coins. Purchases can always be restored, but earned progress cannot.
Drag on the left of the screen to move. Drag the hook button on the right to aim, release to throw. A hook that lands drags the enemy to your bank, where they are stranded and vulnerable. First team to 20 kills wins.