The following procedure will enable a product to appear in the client shop and to appear in "Quicksell" option in the Dashboard.
-In the web admin, go to Settings > Shop Settings > Inventory management.
-Click on the product you would like to become available in the client shop or quick sale.
-Once you have clicked on the product or offer, the edit menu will appear, just scroll down to see the checkbox for Available for client orders or Available for quick sale. Tick the boxes that you would like to enable.
-Click "Save" to save the changes.
NOTE: When enabling Available for client orders, make sure to restart the client PCs after saving the option. This will update the inventory in the client shop.