How to do this hardy weinberg equilibrium equation?

Good example here:
http://en.wikipedia.org/wiki/Allele_frequency#An_example_population
In your case you have all the data.  You just need to divide the individual
counts by the total alleles count (freq_H=2/24 and freq_h=22/24).

I don't work in this area, but the way the result is presented in the Wiki
page I think is a bad idea-- the conversion to per cent obscures sample size.
The way I have it shown I think is better because you can get an idea of
the range of uncertainty due to sampling error.  For example I would
believe that freq_H=200/2400 and freq_h=2200/2400 gives a much more
accurate indication for allele frequency than your data even though they
divide out exactly the same.