Hey Mustachians. I just finished recording a step-by-step walkthrough video for how to do a backdoor Roth contribution on Vanguard's website. I decided to do this after struggling through it myself: Vanguard is great but sometimes it's not exactly clear what and where you need to click. As a bonus, at the end of the video it shows how this will impact your tax return, namely form 8606. Hope it's helpful!
https://www.youtube.com/embed/S75yfnDHN3M