Adding the Gift Widget to your theme code is only necessary if you cannot access the App Block for your theme. Try accessing the Recharge gifting widget before trying the following instructions. 

You can custom code the widget into your theme if you cannot access the App Block, which happens occasionally for themes that have been customized. Refer to Custom coding the Gift Subscriptions Widget for Shopify 2.0 themes for direct instructions. 

This solution requires custom code and is not supported by Recharge as per the design and integration policy. If you require further assistance, work with a third-party developer.