How do u change slayer assinements

[Blue]

yeh i want to know casue i dont rly fancy killing 84 trolls

[deagle]

u cant, u have to finish it or go to a different slayer master

[Axel]

If it's from Burthorpe slayer master, you must finish it. If it's from any other slayer master, you can only go to the Burthorpe slayer master for a new assignment.

[Blue]

oh right i av to go to the burthorpe one ty for dat

[Buzle]

yeh i want to know casue i dont rly fancy killing 84 trolls

You can't switch your Slayer Task from what I remember. :S

[Dynamical]

You can as said above, as long as it wasnt given by the burthorpe guy you can change once.