Changing Login Passwords
Changing your weak passwords to strong passwords is quick and painless.
Since each website does things differently, you will need to find the Change Password page for each site. Here is a typical Change Password web page:

First things first you need to enter your old password. If you have the password saved in a Web Form already, you can restore it:

When restoring a Login, 1Password will make an intelligent guess on where the current password should go. In this case, the saved Login password is put into the first field:

Now that the current password field is populated, you can generate a new unique password for the new one. Select Strong Password Generator from the 1Password toolbar menu:

Clicking Fill will populate all the empty password fields with the newly created password. In this case the New Password and Confirm New Password fields are populated:

Now that the current password, new password, and confirmation password fields are all populated, you can submit the form. 1Password will detect that a Change Password form was submitted, and you will be prompted to update an existing form with the new value:

The saved Login that contains the original password will be selected automatically. Clicking Update will update the password value of the saved Login.
That’s it! You now have a strong password for this website. You can repeat the process on the other sites with weak passwords.
Safety Net #1: Web Form Password History
If you ever need to know the original passwords you used for a login after you updated them, you can find them in the Password History section in the Web Form Details pane:

Every time you update a Logins password the original value will be added to this history automatically.
Safety Net #2: Generated Password History
If you accidently forget to save the new password, you can find a list of all your previously generated passwords in the Password History section:

Every time a password is generated it will be added here automatically.