If you want side bar on the forums then please follow these steps :
1. Install and activate the blank child theme if you are not using any(available in wplms package) .
If you are already using child theme then there is no need to do above .
2. Now inside your child theme folder create a bbpress folder .
3. Inside that bbpress folder please upload the attached file forum.php file inside the zip file.
Now the sidebar that will be show up is the main sidebar in your forums page.