Change a listing after you have created it.
Steps
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Go to Marketplace → My Items.
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Press the ⋮ button at the end of the row and choose Edit.
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Change the title, category, description, orientation, images, price or discount.
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Press Save Changes.

The row menu, opened from the ⋮ button at the end of the row.

The Edit Listing box.
Note
You cannot change a listing's type, or the item it was made from. Those are fixed when you create it. If you picked the wrong one, delete the listing and create it again.
On a listing that is Active, a description and a cover image are required before you can save. On a draft they are not.