Additional Fields in Newsletter Template for Pages

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Tourist
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Hello,

We have setup a Newsletter Template in our Brooklyn Theme (page.newsletter.liquid) & have it added it the Newsletter Page, which looks great!
 
We would also like to add a few more fields to the page version, to capture more information than only their email:
 
Name:
Email: (already have this field)
Address:
Birthday:
Shirt Size:
 
I haven’t been able to find any answers to this online, so I figured I would email in and see if anyone here can help.
 
Thank you,
~MisterZilla