I'm not sure where you're accessing the link to the Forum, as there are 2 different places, but here are directions.
Open the TurboCAD Explorer palette (rt-click any palette tab, it's near the bottom of the list).
Expand "Settings", then Built-in", then scroll down to "Web_Links".
Change "Link_3" to: &TurboCAD LTE Forum<http://forums.doublecad.com/>
Start a new blank drawing (Ctrl+N).
Go to "Help / TurboCAD LTE On The Web / TurboCAD LTE Forum".
you could also use the list on the Internet toolbar (under the House icon)
This forum should open in the Internet palette.
If you're going through the "TurboCAD LTE Forums" link on the Internet palette Home Page, then the "palette.html" file needs to be changed.
Shut down TurboCAD LTE
go to: C:\Program Files (x86)\IMSIDesign\TurboCAD LTE Pro 4\Internet
copy the "palette.html" file to a safe folder for editing; such as My Documents.
Open the file in Wordpad/Notepad or any HTML editor.
Change the link for "TurboCAD LTE Forums" to:<a target="_blank" href="http://forums.doublecad.com/">
Save and copy the file.
Go back to the Internet folder and rename the original "palette.html" to "palette.OLD"
You'll have to jump through the Windows hoops to do this.
Paste the updated "palette.html".
Start TurboCAD LTE
The forum link on the Internet palette "Home Page" will open the Forum in Internet Explorer.
If you take out the target="blank"
statement, the Forum will open in the palette.
Hope one of these works for you.