Open Practice CS. If it's already open, close and re-open.
If the CS Professional Suite sign-in screen appears, enter the Thomson Reuters ID as usual.
Enter the Staff ID given to you. This is the ID from
Setup
then
Staff
in the program.
Leave the password blank.
You should be prompted to enter a new password. Follow the prompt.
You will be taken into the program and your new security access will be in effect.