Just grease it, take your pedal's off, crank's and bb out, then clean them all, tighten the chainring bolt's, make sure the pedal axle's are tight, if they are caged pedal's then make sure they are tight , clean the lot of nice and good, grease the thread's on the bb and put it in nice and tight, grease the crank bolt's and put them on, then grease the pedal thread's and put them on, sorted, if it still creak's then go mental, shout lot's and throw stuff, then buy another bottom bracket.