HI,
Repair Disk Permissions.
First, Quit any open applications/programs. Launch Disk Utility. (Applications/Utilities) Select MacintoshHD in the panel on the left, select the FirstAid tab. Click: Repair Disk Permissions. When it's finished from the Menu Bar, Quit Disk Utility and restart your Mac.
If that doesn't help... try deleting this file.
com.apple.KeychainAccess.plist
/Users/YourName/Library/Preferences. Drag that plist file form the Preferences folder to the Trash, empty the Trash and restart your iMac.
See if that helps. It's ok to trash a .plist file as your Mac will create a new one for you the next time you use the Keychain application.
Also,
Mac 101: Mac Essentials
Important information at this link including Keychain.
Mac 101 - Getting Started with a Mac
Mac Quick Assist
Carolyn 🙂
Message was edited by: Carolyn Samit