Help RC20

I find the manual extremely confusing.



How do I set search parameters, for example search all frequencies from 118.000 to 137.000 am with a step rate of 8.33 or 12.5?



Also, how do I add specific channels into memory so that I can scan them.



I've tried for hours and can't work it out with the supplied manual.



I'm in the UK, just want to scan and search Civil Air, military air and PMR.



Thanks