For setting up the button at Shopify store you need to copy the embed code from the app dashboard and Insert in your theme where ever you want to show become a membership form button.
1. Go to the app dashboard and click setting Icon for having an embed code of your membership form.
2. Copy that code and go to the Shopify dashboard. Navigate online store > Click pages and add a new page for the membership form.
Step 4. Insert your copied code in the box and save the page.
Step 5. Click Save