where do you get a PS3 manual explaining complete PS3 controller functions?

[RaphaelDDL]

up button cycles thru party member

Yup.
If you are a healer, the best is to use up/down until tank, then press X to mark it. Then any action you do will target him. If you want to heal others, up/down but do not press X, this way you will cast a skill on the one you hovered and then it will be back to tank.