You can create a Popup form and link it with a menu button on your Shopify store.
- Open your MailMunch Shopify app
- Click on the Create New button on top right and click on form
- Select Popup form type.
- Select the Theme and design the form. In the Publish step, copy the Trigger on Click code.
- Open your Shopify store admin panel, click on Online Store -> Navigation
- Click on Main Menu or the Footer Menu
- Add Menu Item, add the menu name in the Name tab and paste the code you copied earlier in the Link tab. Click on Apply Changes
- Click on Save Menu.