To do so, it needs to be compatible with your class and you need to have unlocked it on the job that learns it.
When you get lvl 10 ARC, you can swap to CNJ, level it up and learn Cure, then get back on ARC and equip it from the Traits menu. You can check move compatibily there too. Highlight the skill, and all the jobs that can use it will be listed. --- Formerly DWX131415. Updated Username with merger.