Exam 1Y0-341 topic 1 question 59 discussion

Scenario: A Citrix Engineer is asked to implement multi-factor authentication for Citrix Gateway. The engineer creates the authentication policies and binds the policies to the appropriate bind points. The engineer creates a custom form using Notepad++ to format the page which will capture the user’s credentials.
What is the first step the engineer must perform to assign this form to the authentication process?