How to move the circle which I mark as cross in blender 2.82?

Hi Community,

I would like to make the plane perpendicular, to do it I need the pivot to be at the center of the plane but I dont know how to move it.

Appreciate your advise.
Thank you.
image

Normally you don’t need to move 3D Cursor for that - the Origin Point (orange dot in the center of the plane) can serve as a pivot. Just change Pivot Point to something other than cursor:

image

But if you must rotate around the 3D cursor you can Snap it to your selected object (to its Origin Point to be precise). Select the object, go to Object > Snap > Cursor to Selected.

Thanks! When I change the pivot to Individual Origin, it works like i wanted.