Step 1: To get the link to the Sign-up Page, from the Admin Dashboard click on "Configure Sign Up Page".

Step 2: On the following page, click the link "View Sign Up Page". 

Step 3: You get the Sign-Up Page where you can copy the link from the Address Bar at the top. 

Step 4: Log in to your Squareup  account. Select Fotter from the home page.

Step 5. Select  from any of the content, rename and add the link from the referral form.