how to delete keychain on all devices so I can start over

Hi Dwmartinecme,

You can reset your iCloud keychain by following the steps outlined in this support article:

Follow these steps to reset your iCloud Keychain.

On an iPhone, iPad, or iPod touch:

1. Tap Settings > [your name] > iCloud > Keychain and turn on iCloud Keychain. If you're using iOS 10.2 or earlier, tap Settings > iCloud. You might be asked to enter your Apple ID password.
2. If you protect your account with two-factor authentication, tap Restore with Security Code. If you don't use two-factor authentication, tap Approve with Security Code.
3. Tap Forgot Code.
   
4. Tap Reset iCloud Keychain to replace your keychain in iCloud with the iCloud Keychain from your device.
5. Tap Reset to confirm.
6. Follow the onscreen steps to create a new iCloud Security Code.

On a Mac with OS X Yosemite or later:

1. Choose Apple menu > System Preferences.
2. Click iCloud, then select Keychain. You might be asked to enter your Apple ID password.
3. Click Use Code, then choose Forgot Code when you're asked to enter your iCloud Security Code.
4. Click Reset Keychain to replace your keychain in iCloud with the iCloud Keychain from your device.
   
5. Click Reset iCloud Keychain to confirm.
6. Follow the onscreen steps to create a new iCloud Security Code.

Hope this helps,

zfJames