Absolute

On the Design tab, in the Snap group, in the Limits drop-down pane: Click the Absolute button to limit the snap operation to an absolute position. You can constrain the snap operation in the X, Y and Z direction, or any combination thereof, by selecting or deselecting the check box options.

Use the Point drop-down to enter XYZ coordinates.

Alternatively, click on the ellipsis to select a point in the Design Window:

Limits