The declination quadrant is oriented. You just have to refer the R.A. quadrant to the celestial meridians. Now you must refer the right ascension scale to the celestial vault. Choose a star that you can recognize, and of which you know the coordinates. Because we can always see them at northern latitudes and never set.
People living in the austral hemisphere have other constellation which do no set.
Instead, people living near the equator, between the two tropical parallels, can refer to equatorial constellations, as we will see later. Because they have the lowest declination among the brighter stars of these constellations. A problem with these constellations is that they have a high declination, and so, referring to them of the ascension disk, may be your pointer is affected by a quite large error. To improve the precision of the orientation of this scale, you can use constellations closer to the celestial equator. The first orientation you made is sufficient to find the star that you will use for a better regulation.