Loosen the RA clutch first. Balance the scope in the RA axis, then put the scope and the counterweights in the 3 o'clock and 9 o'clock position and lock up the RA clutch.
Now add diagonal, EP and whatever else you will use, gently loosen the Dec clutch and see which way the scope will tilt. If the head of the scope tilts up, loosen the dovetail knobs and slide the scope towards the front end of the scope, reverse if the scope the head dips down. (I.e. Slide the scope towards the end that's tilting up)