How can I set up my skills for use underwater?

I noticed that when I go underwater, my healing and utility skills all change to the default setup I had when I first started playing the game, before I made any customizations.

This leads me to believe that you can specify separate skill sets for normal combat and underwater combat. It only makes sense, since you have a different weapon in each case.

How can I pick which skills I will have available underwater?

Solution 1:

To change your Utility skills for your underwater skill set, simply dive underwater, click the arrow, and select the skill you want to have in that slot.

The skills with the red Xs on them can't be used underwater, but the others can. In my case, I chose Sharpening Stone. Once I get back on land, however, it will automatically switch back to Signet of the Hunt.