Create the Custom CSS File
To create your own CSS file go to store admin > Online Store > Themes > Actions > Edit code > Assets folder, and click on Add a new asset. On the pop-up select Create a blank file and name it subscribfy-custom-styles.css
App Embed
The easiest way to add a link membership dashboard is via an App Embed. This is a special widget that you enable within your Shopify theme that will attempt to add a membership dashboard link to your customer account page.
You can access the App Embed directly by clicking the button on the Installation tab of your membership details page.
Advanced
Once you've configured your membership perks and pricing, you'll want to add the selling plans (pricing options) to your membership product within Shopify.
The easiest way to add selling plans to your membership product page is via an App Embed. This is a special widget that you enable within your Shopify theme that will attempt to automatically add selling plans to your membership product.
You can access the App Embed directly by clicking the button on the Installation tab.