Using Object Snap for a Single Point
To snap to a geometric point on an object
- At the prompt for a point, press SHIFT + right-click. Then choose the object snap you want to use.
- Move your cursor over the desired snap location. If AutoSnap is on, your cursor automatically locks onto the snap location you selected, and a marker and SnapTip indicate the snap point.
- Select an object.
The cursor snaps to the eligible location closest to your selection.
Object Snap toolbar: 
Alternate: SHIFT + right-click (for cursor menu)