on the char to be ressed:
stand next to the flower (not so closed to the flower or your resser might be dead as well.) then
type /arc on.
for the resser:
make one cleric [i prefer level 10 or below 20 just in case it's attacked by mobs].
type
/arc on and stand next to the char to be ressed.
and if you want to do it while you're AFK..
go search for some auto ress tools here xD
just use search button and you will find what you are lookin for
PS: you need rumata's loader to use
/arc on (auto accept res)