You point out that one of the circles turns by hand, this is the Right Ascension (RA) circle. The Declination circle should be aligned if you polar align the scope. (This isn't always the case in some scopes.) If you polar align the scope and rotate it towards the north celestial pole the Dec circle pointer will point to 90 degrees North. If you now point the scope at a known star, say Vega, the Dec circle will read +38° 47′. Vega's RA is 18h 37m (to the nearest minute) so you need to rotate the RA circle so that the pointer reads 18h 37m. You can now rotate the scope to the RA and Dec of your desired target. Make sure you understand celestial coordinates. Declination is specified as degrees north (+) or south (-) of the celestial equator, whereas RA is specified in hours (subdivided into minutes and seconds, which are not the same as minutes or seconds of arc).
If your scope had a clock drive (and depending on the design!) the RA circle would move at the sidereal rate with the scope, so you'd only have to adjust it once and engage the drive. It looks like your mount is manual, so you'd have to realign the RA circle every time you used the circles to acquire a new target.
Here is a brief guide http://calgary.rasc.ca/scircles.htm
In my judgement the best explanation of all of this (celestial coordinates, time in astonomy, and setting circles) is here
PS: I'll repeat what the others have said in their responses, the scope in your picture is not polar aligned (unless you're at the North Pole!)
Edited by JamesMStephens, 18 June 2019 - 11:26 AM.