By all means see Graham's links.
However, look at your event and look at your code.
1. What do you want to insertafter the bookmark? The text you type? Yes, then:
Bookmarks("customername1").Range.InsertAfter TextBox3.Text
2. Do you really want to insert text after the bookmark every time that text is changed. For example, when you fix the code as shown above and type your name the result is: "JayJaJ"
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