Register the Employee for One Click

Log into CCH as pmccarthy -no password (So you have permissions)
Search for the employee. Go to the personal tab and add in their TJ email address.
Click back to the employee line and select using tickbox
Click the Green "Activate" button

They will receive an email, with a temporary password. They should change the password to something they know.

Get them to test the DTA Tax Button in a Tax Return.

You may need to change the default browser to Chrome.