top center of the screen, find the reshearch botton

when you clik it you get a screen on the left side you have(going from top to bottom)

Millitary

civillian

fleet logistics(this is the one you want)

press fleet logistics

you get a new screen

top ½ is number of Cap ship crews

bottom ½ is supply(this is what you want)

Remember you need a reshearch lab(of any type) for each level you wish to reshearch

hope that was enough, if not just post again

Just be wary of the percentage of your income that is lost when increasing the number of fleet points available - researching too many levels too quickly will cause your economy to crash, leaving you no materials to build a fleet with.