Today is the first day that registered patent filers can start the migration process from using PKI certificates (and Java) to using the new web portal - my.uspto.gov.
Step 1: Log into your my.uspto.gov account.
Go to the account, and make sure that you enable always use two-factor authentication.
Click "Save" at the button of the screen, and then "Log Out".
Step 2: Log into Private Pair.
There you will be greeted by a pop-up message (see first image).
There also is a blue bar at the bottom of the window.
Click on a "Migrate Now" button.
Step 3: A new window opens and displays a message. Click "Continue".
Step 4: A new window opens and displays the following message. Login to your uspto.gov account.
Step 5: After you link your account, click Continue.
Step 6: Confirm account information, and e-sign the form.
Step 7: Await confirmation from the USPTO. This supposedly can take up to 24 hours.
1. If you first log into Private PAIR and get then error messages while trying to log into USPTO.GOV, log into USPTO.GOV first (do not log-out) and then log into Private PAIR.