I want to do exactly what you are doing. My accounts are held by Etrade where they unfortunately seem to have no idea how to make this happen.
Never done a conversion at eTrade, so I’m not sure how to help with the details, but as others have suggested, if you don’t already have a Roth IRA open at eTrade, that’s probably the first thing to do. If eTrade can’t give you enough information to figure out how to do the transfer from the Traditional IRA to the Roth IRA, then I would also second the suggestion of investigating opening accounts at another brokerage. Personally, I am aware that Vanguard, Fidelity and Merrill Edge all have webpages set up to do the conversions pretty easily - you just tell them how much (either in shares or dollars) and they will move the money. As a bonus, you may be able to snag a bonus of a few hundred dollars by transferring your account to a different brokerage, as it’s the time of year that brokerages are looking to entice customers to open accounts with them. (Probably not at Vanguard, but I’ve gotten bonuses at both Fidelity and Merrill Edge before, and I think I’ve seen Schwab offer them, too.)
AJ