Is Newsletter Available in Aryan?

Yes, Aryan has a newsletter available inside it with 4 different designs that you can apply on the footer.

Newsletter works with the Mailchimp functionality for which you need to install the Mailchimp WordPress plugin.

MC4WP: Mailchimp for WordPress

Then enable newsletter from your Theme Options > Newsletter > On >

Select newsletter style

Configure information

Insert Mailchimp form ID There.