After purchasing your Pop Shots, you can then sell them on the OpenSea marketplace.  Here's how to do that:

1) Go to "my collection" on your Spank PopShots

2) Click on a particular card to open and view the card details:

3) Once you have the card open, at the bottom right, there will be a link to OpenSea:

4) From OpenSea.io, click your profile image in the top right and then "My Profile", then click "Select Sell" on the top right:

5) Choose the price, type of auction, and other preferences.  When you are finished, select "Post your listing":

6) You'll then be asked to complete your listing.  Please note, if you've never sold on OpenSea before, you'll need to initialize your wallet.

To see the items you have listed to sell, from your profile page select the "Activity tab".

You will see the item you just listed labeled with the transaction "List".

For issues with OpenSea, you'll want to reach out to OpenSea directly or visit their listing help doc.

If you have any further questions, our support team is happy to help.  Feel free to email us anytime at support@spankchain.com