I have this ring but the cursor is not on the object. How do I get the cursor to be at the middle of the ring?
Top right: enable Options: Origins and move it… do not forget to disable it afterwards…
Rightclick → origin to geometry
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Right Click > Snap > Cursor to Selected.
Or use Shift-S > Snap > Cursor to Selected.
But it looks like you actually want the Origin at the Object, which is what @Meshmonkey told you how to do.
This is basic stuff. Read the Manual and watch some beginner tutorials. Both are available in Blenders Help Menu.