This answer assumes you are asking about your online Intuit Account.
Well, it depends on whether you know your current password or not. You didn't mention a roadblock to logging into your account, so these steps are if you are just wanting to change it for security or other reasons,
- Log into your Online account and in the left menu column scroll way down to the tab Intuit Account.
- In the account settings, go to left menu column and choose tab Sign In and Security.
- You should see a Password setting. Expand it with the arrowhead, and you should be able to change it there.
On the other hand, if you don't know your password to log in and are asking how to reset it and recover your account, post back for instructions.