To update your Discovery password and account information, you must be on the Discovery Building Network or UW WID VPN. Visit https://myaccount.discovery.wisc.edu/. This password is your means of accessing the DataVault, building printers and wifi, and building compute resources.
The current minimum character limit is 12. Unfortunately, 8 character minimums permit passwords that can be cracked in a couple hours or less. For all the details on your DiscoverIT password, see: https://kb.wisc.edu/discovery/112995
To test the security of any of your passwords, visit https://howsecureismypassword.net/. (This site does not store your password.)
If you’ve been keeping track of too many passwords, consider using a password manager. UW-Madison provides 1Password licenses to students, staff, and faculty. It allows you to maintain separate campus and personal accounts.

