Hey there Nilrem435,
Thanks for reaching out to the Apple Support Communities.
For the best steps on how to update your login information for user names and passwords saved for websites in Safari, check out this link here: Change Passwords settings on Mac - Apple Support
On your Mac, use Passwords settings to view, add, or edit the user names and passwords or passkeys you saved for websites.
To change these settings, choose Apple menu > System Settings, then click Passwords in the sidebar. (You may need to scroll down.)
Info
See your user name and password.
A warning icon is shown next to a website for any of the following reasons:
- Easily guessed
- Appeared in a data leak
- Reused on another website
If you reuse a password across different websites, or you have an easily guessed password for a website, details appear above your user name and password. Reusing passwords across different websites isn’t recommended—if an attacker knows your password for one website, they might be able to access your accounts on other websites. To create a stronger or unique password for the selected website, click Change Password on Website.
Edit: Update the user name or password if you changed them on the website, change your password by visiting the website, or delete the password from your keychain. If the website supports verification codes, go to the website, sign in, then get a setup key. Click Enter Setup Key, then enter the key. This extra level of security helps guarantee your identity.
Let us know if that's able to help.
Take care!