There are 2 ways to add a point guide to a sheet.
2.The second method is to click on the button in the Add→Guides button group.
The point guide and its X,Y position during initial creation
In both cases, as you drag the guide to position it you can enter a number value by first pressing the Enter key and then the X and Y coordinate or click the left mouse button to place the guide.
You can press the 's' key at any time to turn snap on or off.