Add a password to a keychain on Mac
You can use Keychain Access to store passwords and login information for servers, email accounts, and other resources, so you don’t have to remember the information yourself or enter it when you log in.
In the Keychain Access app on your Mac, select a keychain in any of the Keychain lists other than the System Roots keychain.
Note: You can’t add a password item to the System Roots keychain.
Choose File > New Password Item.
Tip: To add a new keychain item quickly, click the New Keychain Item button in the toolbar. The type of item added depends on the category selected. For example, a password is added when All Items or Passwords is selected.
This option isn’t available for My Certificates, Keys, and Certificates.
Enter the information for Keychain Item Name, Account Name and Password.
To make sure your password is correct, select Show Password to view it.
When you create an account or log into an app or a server, a keychain with a password may automatically be created for you or you may be asked if you want to have your keychain remember the password for that account, app or server.
Tip: To copy a password in a selected item quickly, choose Edit > Copy Password to Clipboard.