right now the price is 0.0186. the bid and ask is as follows:
bid: 0.0184 x10,000 (10,000 share order for a buy at 184)
ask: 0.0186 x21,600 (21,600 share order for a sell at 0.0186
if you bid under the top a 0.0183, the top order has to fill first, but you may get left in the dust.
if you try to buy at the ask, you will get your order filled quicker.
be careful and the above it just to hopefully give you a better understanding, although it is very rough :)