How to Disconnect Your Dropbox Account
To change your password click on Profile (1) then click on the Account Profile (2) tab at the top of the page.
Scroll down to the Third Party Accounts area.
Click the Disconnect (3) button.
Upon your next attempt to send content to Dropbox the system will require authorization.
Remember to read, understand, and abide by the license agreement that accompanies your digital product purchase.