This is dependant on the access level set for your CRM user account. You would need to ensure that the account that you have selected in step 10 here has access to the data or is an admin account. If the access level is correct then sometimes you may need to press the "refresh fields" option in the relevant drop down a few times for these to appear.
If this still doesn't appear then please contact Zapier's Support team who will be able to help troubleshoot further: