The sidebar that Adler theme includes is located on the bottom of the post and can be managed through Appearance -> Widgets area. Please take a look.
Thank you for the reply. I know, I have tried. But I can’t find this option at the bottom of the post, and in the Wirdgets area either. It says that all sidebars are inactive.
Please open a ticket on http://help.pixelgrade.com and I will take a closer look on this 🙂