How can I post submissions data on my webpage?

how do i replicate this whenever someone signs the pledge and their name and city is shown on the page? 

I think this may be possible to with a report, reports can be shared with their own direct link or embedded on a web page just like you do with JotForm forms. 

To get more information, please check this guide: https://www.jotform.com/help/326-How-to-Create-Form-Reports-in-JotForm 

I hope this helps.