I need to build dynamic string that contain a link to SharePoint list item in edit mode.
I used the nintex forum: http://connect.nintex.com/forums/thread/5536.aspx
What should the string contain?
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It's self explanitory in that article you referenced. The build dynamic string operation Peter references shows you exactly what you need to do. With that created, you can email that to a user, and when clicked, it will open the item in edit mode.
If you wanted to edit the item with an ID of 1 from the list called "Test", you'd use something like the following (substituting the appropriate site URL)