Hi marshalm,
When you created your MySQL user, you will have been asked for a password, which is what you will need to give to Moodle.
If you are unsure what password you chose, you can delete and recreate the MySQL User that you created with a different password. You can do this by going into "Databases", at the top, clicking the cog next to the database in question, and then selecting "Manage Users". From here, you can delete and create users. When you create a user, you will be asked which password you wish to use.
However, you could alternatively switch to the cPanel x3 theme if you really want to. You can do this by clicking on "Switch Theme" in the top right of your cPanel.
Thank you,