I am struggling to find the "Ask ebay to step in" button. Where is it ?

I have returned an item to a seller not using the ebay label. On the returns details page it says I can ask ebay to step in. How do I do this please >

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Find one of the Messages that EBay have sent you regarding the Case. Find the Link - See Case Details. Click on that to see if the option to Take Action or Ask EBay to Step In is there or not.