There are several reasons why you'd need to place a manual order for the customer, here is how:
> Go to the "Orders" page in your Shopify account
> Click "Create Order" (top-right)
> Find or create a customer
> Browse products
> Click "Vendors"
> Click "Viralstyle"
> Select your product & add to order
> Accept Payment.
Note: You can also email the invoice or save as draft.