To edit your posted items for sale, access your profile screen. Under the "Items" tab, choose "Selling" and select the desired item.
Tap on "Edit Details" to modify the pictures, title and description, price, location or the Campaign associated.
When you are done tap on "Update Item" to save your changes.
To delete your item tap on the dustbin icon on the top right corner, and select "Confirm" on the pop-up confirmation screen.