Click Queue to send the export to Media Encoder, Export to send it out via Premiere Pro.
Fastest Export Possible
The Smart Rendering workflow will help you how to export up to 20x faster. It takes a little extra work, but worth it. Read this FAQ: What is Smart Rendering?. Need a hint as to what it's about? Basically: Media Optimization. Personally, I use smart rendering as much as possible in my own workflow.