I have having a similar issue for my brokerage account using TurboTax desktop where the username/password field was not showing up in the doc import screen. I tried some other brokerages to see if there was a similar issue. One of them prompted me to sign into my intuit account.
I went to File --> Login and logged into my intuit account. Now when I hit continue in the document import screen another window pops up for me to enter in my brokerage username/password.
