fields

Hey ! I created a system predator pray , and I applied commands adhere repulse and align,
now I have to " bother the system " by applying to these three commands three different

force fields that I go to create a special effect ! For the command repulse I don't had 

problems , but I can not apply it to adhere and align command .. 

someone can tell me how to apply a force field to these two commands ? 

thank you