I need to run background checks, but the "invite candidates" button is grey and there is nothing on my home screen. I don't think my account has been turned on yet.
New accounts must be credentialed by Checkr’s Customer Support team before they will be allowed to run background checks. We use the information provided in the signup process to assess the validity of the business and its permissible purpose. The invite candidate button will be disabled until the credentialing process completes, which usually takes less than 1 business day.
See Get credentialed to run background checks for additional details.