In order to not always delete and create new offers, you can edit your existing offers. When you're in the Offers overview page, click on the Offer ID of the offer you would like to edit. A page with all the information for the requested offer opens.

Click on "Edit" on the top right to make the desired changes to your offer. After you are done, click on "Save". To discard the changes you just made, simply click on the arrow top left.

If you don't want to edit but rather delete the offer, simply click on "Delete" on the top right. Confirm your request to delete the offer permanently.