Email Setup

I’ve been trying to setup my emailing client in TaxCycle. But I’ve had no luck so far. I have tried windows mail but it’s not even opening up nothing. then I downloaded Thunderbolt. I get it to open the thunderbolt main window but no new email with the attachment (let say T183) is ready.
I normally use Gmail in the browser for all my email needs.
Any Idea what I’m missing?