you need to install a virtual android phone in your computer, to post in the Offer up app, here are the instructions on how to do it
Using a virtual android phone in your computer, we can post in the Offer up app, this will post your ads in offer up and it will let you sell your items faster, it uses our image border and image resizer so you are able to post the same ad if you want it to, automate your postings and start selling all your products.
Post all your cars in offer up using bluestacks, this way you can sell your cars in offer up and post them. So people contact you more easily.