Dear hugh8008,
http://cutesoft.net/example/general.aspx, this is the online demo, when you click button "Insert Hyperlink", you will can set the property "nofollow". By default, hyperlink doesn't contain this property.
If user want to add this property to hyperlink by default, please follow steps:
1. Please open "CuteSoft_Client\CuteEditor\Dialogs\Tag\tag_a.ascx", search the following line:
<input type="checkbox" name="Nofollow" id="Nofollow" value="Nofollow" />
2. change it to:
<input type="checkbox" checked = "checked" name="Nofollow" id="Nofollow" value="Nofollow" />
After you make this update, the insert hyperlink dialog will change to:
Hope it helps.