How do I add a hyper link to get back to the JotForm to edit / approve

The excel summary sheet is great, but need a link in there so my final approvers can easily get back into each submission and approve and edit $ values.

You can do this with the Edit Link added in the email sent to the approvers. 

{edit_link} is the actual tag you need to add in the body of the email, similar to the guide below:

https://www.jotform.com/help/40-How-to-Let-Users-Update-Their-Form-Submissions-at-a-Later-Date 

If you give approvers access to your form submissions page, you can have them edit the submissions in the page as detailed in the below guide:

https://www.jotform.com/help/325-How-to-Edit-Submissions-Made-on-Your-Forms

I hope that helps. Please let us know if you have any further questions.