I’m try to add storage and everytime it say to double click the side bar but when I try double clicking it just disappears

What your iPhone is asking you is to Double Click the SIDE BUTTON on your iPhone that it points to.

Axel F.

jmcateer91 Said:

"I can’t add additional storage. After picking to pay $2.99 it says to double click the side bar and when I try to do that it disappears please help"

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Perform this Using a Computer:

Have a computer handy? If so, perform this upgrade suing a computer, as it would be more user-friendly doing so. Go here: Upgrade to iCloud+ - Apple Support