How to add a subscribe button and a description to my newsletter section

[Thecozyliving]

I need to add a subscribe button to my newsletter section and a description. 
This is my newsletter section:

i need to make it look like this: 

[Thecozyliving]

This is our store URL: https://cozycollectivelb.com/
Please note we're trying this on a separate theme copy.

[Thecozyliving]

This is our store URL: https://cozycollectivelb.com/