First off its not the monk trainer in khal :-p

Its a monk NPC in khal.  If you think way back to when you did the first form quest you had to hail an NPC on the west side of khal (outside the city on the sandy area under a tent).  this is the npc you need to find,


The quest to change is dirt easy.
1) Hail the 2 monk masters for the forms your not (in your case drunken and harmonious)
2) pick a new form (aka harmonious)
3) go to the harmonious master and do the 10 min quest to become one

actually i been doin this monk style change now for two styles already i was dragon originaly but went to the grand master in khal he is on the land side of khal under one of the tents on out side.

the style u choose he will have u get a letter signed by the other two style masters then u return the letter then u go see the monk trainer u want to train with for ur style u want

. so the trainer gives ya cple qeust to prove ur  loyal
then what happens is he gives u that style aum. u then have to re mem all of that styles abilty thru aums  it's not long at all to do.

and honestly i think its worth doin at lvl 50 u get to see what the other styles are like and there is a significent diif imho.

but i went from dragon which i had all way to 50 tried harm second wasnt really impressed to be honest  dragon got harm beat  the so called "abilty's" of a harm is near to none imho not worth the lower dps.

im trying drunken now and im very impressed with that style compared to dragon still in the testing mode grp wise n pulling techq ill keep ya posted what i choose to  stick with and why

Well personally i like my dragon so far...With my bear shaman we duo'd a lv 42 six dot at the top of island of madness and we're only lev 41   But i could see at lev 50 when DPS of offensive stance (for drunken) is only 2% less damage than dragon why it could be much better... I'd really have to check out the skill and chains though to be sure.  Of course i have no experience with the other two forms yet.  Let me know how it  goes for your as harm in comparison to dragon.