Login to Learnyst as Admin and go to Website builder. In website builder you can add your custom code by adding a custom code section to your landing page from the side bar. Follow the below steps to do the same.
In side bar go to sections and add a custom code section.
In custom code section click on Edit HTML.
Now you have to replace the existing custom code with mail chimp signup form code.
To do this, login to http://mailchimp.com/ and go to Lists ---> Stats ---> Signup Forms.
Note : If you do not have mailchimp you have to signup and to know more on how to create mailchimp signup forms go to
In signup forms choose embedded codes. This is a Generate HTML code to embed in your site to collect signups. Click on Select button of Embedded Forms.
Copy the embedded code
Get back to Learnyst website builder and replace the existing custom code with your mail chimp signup embedded html custom code that you just copied from mail chimp and click on Save.
Once you have saved this custom code click on Save in sidebar to save the settings and Publish it.