What problem u r facing? if u have uploaded ur post then go in edit and there is small box on the left side add cover then u can add cover
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I did that but the picture isn't getting displayed
On upper left side there is a button link to add cover image. If you don’t add cover image it will automatic be your first image of a blog.
You can do that from your laptop....where in you see a Add Cover Image button right side of the top menu....
Try doing it from a desktop or laptop through website if you are trying from app