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 big commerce account.

Step 5. Go to Storefront.

Step 6. Under storefront, select Web Pages

Step 7. Select create a web page 

Step 8. Fill up the web page details—page name and link to your affiliate registration—by selecting Link to another website or document under Page type. Under the navigation menu, click check.

Step 9. Click Save & exit. 

Then reload your site so you can see the added web page where the affiliate registration link is added.