To reset your account password, go to Settings >> My Account, and click "Change account password" towards the bottom of the page.
Please note, if you are a Google Apps user or if you use the "Login with Microsoft" option to enter your Nimble account, you do not have a password with Nimble. If you would like to complete any action in Nimble that requires a password, you may set one up from this same page!
If you have any questions, please write us at care@nimble.com, initiate a chat from this FAQ, or join one of our Nimble Onboarding and Best Practices sessions, held every weekday at 9 AM PT.