To get the web embed code from your Delivra account to add to your Facebook fan page tab, first login to your Delivra account. Then, in the Delivra account manager area, go to "Utilitiies".
Within the sub-options under Utilities, select, "Web Forms". The "New Subscribe Form" allows you to create a simple form with name and e-mail address that would be captured. Complete the setup and copy the code that Delivra offers.