To use SmartPost, your items must already be in your Inventory. Go to your Inventory, and under the SmartPost tab, select a Facebook group, and it will auto-match your already created albums you would like your Listings to post to. It will show a percentage of confidence in the auto-match.  Double check it has selected the appropriate albums. If you do not see your albums have been auto-matched, click the Do Not Post field.  A selection of all available albums in that group should appear, or you can Create New.