How to unlock Jobs ?

[GefilteFish]

I'm not sure that there is any info in game about which cross class spells you can use on which class/job. They show up in your additional actions window after you get them on the secondary class. Of course, that doesn't help much when you need to get to level 36 or something to try it out.

Fortunately, there are online resources that show you what classes and jobs and use abilities cross class. Check out xivdb.com Each ability lists what classes and jobs can use it.

Edit: Actually I just realized that the tooltips for each ability tells you which classes/jobs can use it.