For the safety of your Dropbox account, it’s wise to modify your password from time to time.
That’s why we explain below how you can easily change your password using a desktop computer:
 1  Go to Dropbox.com
and log in with your current email and password.
 2  Settings
is an option you will see pop-up when you click on your name in the upper right corner.
 3  Select Security
it’s a tab item in the Settings menu.
 4  Change password
is a link that appears in the security menu now.
 5  Change your password
after entering your current password and the new one that you want.
 ✓ Result
You have now modified the password of your account.
Source screenshots (& thanks to): Dropbox.com