I found
http://forums.asp.net/1052049/ShowPost.aspx and cobbled together the following steps:
My Attempt To Upgrade FreeTextBox (FTB) in DNN
1. Download and expand FTB files from http://www.freetextbox.com/
2. From FreeTextBox\bin, copy FreeTextBox.dll to DotNetNuke\bin and to DotNetNuke\Providers\HtmlEditorProviders\Ftb3HtmlEditorProvider\bin
3. Copy FreeTextBox\aspnet_client\FreeTextBox\*.js to DotNetNuke\Providers\HtmlEditorProviders\Ftb3HtmlEditorProvider\ftb3
4. Copy the directories images and Languages from FreeTextBox\aspnet_client\FreeTextBox to DotNetNuke\Providers\HtmlEditorProviders\Ftb3HtmlEditorProvider\ftb3
5. Copy the directories Office2000, OfficeMac, and OfficeXP from FreeTextBox\aspnet_client\FreeTextBox DotNetNuke\Providers\HtmlEditorProviders\Ftb3HtmlEditorProvider\ftb3
6. Recompile the a solution that includes the HtmlEditorProvider project like DotNetNuke.Providers.sln.
7. Clear your client browser cache. I was getting JavaScript errors that said: Line 51. error. this.ftb.id is null or not an object. I think my browser had cached earlier versions of the javascript and so I had to clear these to get everything to function properly.
Now, most of it appears to be working, but unfortuantely the Text property is blank when I try to update or save text. In Ftb3HtmlEditorProvider.vb, line 98, the value of cntlFtb.Text is an empty string. Perhaps I am suffering from the problems mentioned in http://www.freetextbox.com/forums/ShowPost.aspx?PostID=4926 and http://www.freetextbox.com/forums/ShowPost.aspx?PostID=4945
and http://www.freetextbox.com/forums/ShowPost.aspx?PostID=4943
and http://www.freetextbox.com/forums/ShowPost.aspx?PostID=4905?
Anyone have any suggestions? or advice? I think I'm restoring back to FTB 3.0.5.