If I click one point, can I know its actual coordinate?
(x,y,z)
Or, latitude - longitude - altitude.
Hey mate, as soon as you run Step 1 you will be able to see the coordinates of the point you are interested in. Simply move your mouse around and on the right corner you will see them. But these are the coordinates of the output system you have selected.
There is also a nice table on the right of the screen when click on the point you are interested in you will not only see the coordinates of your point but also in how many images it appears, the error etc.