Did you mean to skip the creation of the CO user? You mention you were going to do so, then the video skips ahead to a point where the CO is already created.
Looks like the PRECO user is used for login, then the command
createUser CO admin acloudguru123!!
is executed to create the user
I just found out the answer to my question 🙂
To create the CO user you will need to do the following
1) you are login in your CloudHSM as PRECO
2) aws-cloudhsm>changePswd PRECO admin
Answer "y" and you should see a changing password message that the password has been changed
3) if run the command listUsers you should now see the new CO account and the AU user
Scott’s link above will take you to the document.