Help...

i was wondering where i can find info(pics preferably or words) on how to use the product seafoam the correct way.by searching other posts i found out that i should not put it in the crankcase.well the part that i have problem is putting through a vacuum source into your intake manifold(brake booster) am new to this and i have no idea how would i be avaible to that.i have 99 elantra,thanks in advance for the help and any suggestions on doing this,i appreciate it