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In the Create Keypoints in Active Coordinate System dialog box,

Enter 1 for Keypoint number
Enter 0 for X and 2.8 for Y
(The Z value defaults to zero)
Click Apply (which accepts the input and then brings back the dialog box for further input)

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Note that you can move to the next field using the Tab key.

Enter 2 for Keypoint number
Enter 1.5 for X and 2.0 for Y
Click Apply

Enter 3 for Keypoint number
Enter 0 for X and 0 for Y
Click OK (which accepts the input and then closes the dialog box)

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