Always have your passwords saved in a word document Carol and back that up!

The password you need to use for that keychain thing is the private posting key.

Also, it needs to have your username in the top area like this:

So where it says 'Steem password or private key' that is where you paste the private posting key, and the best way to make sure that you make no mistake in the process is to delete any key (you see where the dots are in the password field) that is already in there manually, i.e. just use delete key in there until it is completely blank and then paste the private posting key and hit get started 🙂