I know of a couple of methods.
First you can use templates - but I'm assuming you do not have your site set up to utilize templates.
Another method I would use. Is the excellent find and replace command.
For example, lets say on every page you have identical writing like. "Copywrite 2002, webpagedesign all rights reserved" or something like that.
You could first open find and replace
--In drop down Find In: Select Folder
--Box that pops up to the right of Find In: browse to the folder (most often the main folder the website is in).
--In "Search For" Select Source Code
--Box to the right of Search for: Copy and paste your text. in this case it is: Copywrite 2002, webpagedesign all rights reserved
--Box Replace With: <a href= "mailto

istol@yourdomain.com">Feedback</a> Copywrite 2002 Pistol, All Rights Reserved
--Hit Find all - this will display all documents that found the text you were looking for.
--Make sure everything is correct, hit replace all.
Naturally you have to replace the email address I put with the valid one. And you don't have to use the copywrite line I did - anything specific that is on every page close to where you want the feedback to be at will work.
Hope this helps.
Stuart