You need to go to the Inventory Management List Display which is in the Inventory dashboard.
If you can't find this List Display, check if you have moved it to the Hidden List Displays. If it looks that such List Display doesn't exist in your account at all, you can easily create a new one, by following these instructions.
Once there you'll need a. to set minimum alert levels per product and then b. search for products needing to be ordered ie those below the alert level (see radio button at top left).
That type of search - if done regularly - can allow you to keep track of the stock levels of yours that are important to monitor.
Or login to your account.