Greetings, @El Nica.
Welcome to the Community! Let's work together so that you're able to email invoices in your QuickBooks Desktop account.
First, let's upgrade and update your QuickBooks Desktop to the latest release and version so that we can narrow down the cause of this problem:
If the issue persists, please let us know if you're receiving any errors or something holding you back from being able to email invoices.
I'm only a reply away when you're ready. I'll be just around the corner to check in on you!