UI-solution for iOS/Swift

I hope that this kind of question is welcome here If not, please excuse me !

I have a TableViewController in iOS/Swift on top of the workflow:

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In my setup, this controller is use to update/add rows:

SetupViewController

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When the image on the right is tapped, a collection-view is shown and you have to select a new image:

enter image description here

I hope you can give me hints on how to proceed (perhaps with some code-snippet)

How can I "mark" the images in the SetupViewController on the right, so that the user recognizes, that he/she should tap on image to select another one (i.e the question mark when adding a record) ?

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