Hi kfgross,

We have now automatically enabled this feature, so you won't see it in your settings.  To turn an estimate into an invoice, the estimate:

• must be either Accepted or Pending, not closed status (look for the status on the upper left of the estimate)
• must be saved (on lower right of the estimate)
• must not have been fully invoiced already (see if any invoices have been created on the upper left of estimate)

Once these are true, then you'll see the "Create Invoice" option on the upper right.

Please let me know if that helps, and thanks so much for choosing QuickBooks Online- we appreciate you!