I'm doing the tutorial and there's an arrow pointing to the slot 1 attack and I'm not sure what to do with it. I have made a Dragon class Namekian and his heal is in slot 1.
Help please.

hmmm.... press K to open your skills and drag the skills to the hotbar.. i think

That should just mean to use it. Try clicking your character and then using heal on your self.

I've tried both and neither seemed to work.

you can always skip it.there is an arrow button in the bottom right side

Create another char,when you reach that part open your Skill panel and drag the skill to slot 1.

You can Skip, Or just make a new char.

just skip it no one do that tutorial

Not really, I did it on my first character. I think it helps you get a sense of the game play. The game is probably telling you to click and drag one of your skills to your hot keys. But you can always skip the tutorial by clicking on the arrow at the bottom right hand corner.