Hello,
Thank you very much for choosing our theme and for contacting us.
Please specify what is wrong with the login form? It opens https://gyazo.com/9c8778abe17d0b3d685960bb76ee5dbd
Do you mean you want it as a sidebar?
Please navigate to Woodmart > Header builder http://prntscr.com/iyd2pe
Choose the proper header type (your current) http://prntscr.com/iyd333
Enter My Account element and set the Sidebar.
Take into consideration that there is also the mobile view of your header http://prntscr.com/iyd3v3 do the same in the mobile view.
Best Regards