How can I connect to my iTunes because the problem...

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Dear to buy Game or program from Ituens store, you should have readeem card or code, to buy readeem card click on the following link:
click here
Open your iTunes app.
and you must sign in with your Apple ID.
From the menu bar at the top of the iTunes window, click on Account > Redeem.

To use camera in your phone to redeem your card, press Use Camera.  to capture the redemption code.
and you can watch thd following video
click here
Now you can buy Game frome itunes stor
** Dear, you can after you have finished preparing iTunes to buy Vbucks for the Fortnite game
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Yousef Saleem