On the admin, go to “ATUM Inventory”, then select ‘Stock Central’ from the sub menu.
Next, you will have to search for the product to be updated.
You can click on ‘search in’ to search by name, sku, or any of the other options
When you find the product, you can click under the ‘in stock’ category to set it easily from this main screen.
Otherwise, click on the product to edit it.
Next you will scroll down until you see the ‘product data’ window.
Click on “Inventory”. There, you will have the option to mark a product out of stock, in stock, OR check the box next to “Track stock quantity for this product” if you want to type in the actual number in stock.