leftright93 have you filled out the survey located on the picture you've attached? Fill the survey out with your Apple ID and name and your account will be created to log into baseline with.
The link for baseline is under number 5 of getting started in the work this tab.
You will need to enter the Apple ID and password, from there you should see tasks (if any are available for you) and this is where you can start working.
It can take a few days for Appen to create an account for you so be patient.