For getting battle rewards
After you have trained or purchased a Profession, hit P to bring up your abilities book. Then, look for a new icon that has been placed in there for that skill. You can drag this icon over to your action bar to make it easier to find and use. If you can not fit buy potbs Doubloon on the first row of your action bar, place it on a different row by left-clicking on the scroll arrows to the right of your action bar. Choosing suitable profession and skills is very useful for getting battle rewards.