How to show up "DataBase" close to Documents, Music etc. pp?

Good Evening,

I'm not pretty sure, or if I have still created the Folder "Database". Since I need it each and every day, I'd like to join through the Sidebar, where "Documents, Music" etc. pp. are still allocated.

How I can manage to expand the Sidebar, or do I need to replace another Shortcut like "Music"?

I'm lost, Sorry!

Thank you and Kind Regards

Pit