How to create good looking Email Opt-In form

I would like to add an email newsletter to my blog https://www.radarbazaar.com/

I am an AWeber member but their email forms don’t match the design of my site.

How do I make my email form look like this? https://demo.studiopress.com/metro/

They are using a plugin called Genesis – eNews Extended but I still can figure out how to get the result that I’m after.

Thanks