Hotkey

Your hotkey bar is located at the very top of the screen where there are slots with numbers to the right of the logout button. The purpose of the hotkey bar is to be able to set a certain skill from your Skillbook as a number on your keyboard so that you don't have to open your book every time you want to attack, call a pet, cook, etc.

Simple hotkeys: To get your hotkey bar to work, you have to open your Skillbook and click on the tab at the bottom where the skill that you want to set is located. You then click and drag the icon of the skill to the number key that you want to set it to. (Note: If you don't have that skill unlocked in your book first, then you can't set it on your hotkey bar or use it.) When you click the number corresponding to the skill you want to use on a target, that skill will trigger and cast the skill. If you don't want a skill in one of the slots, just click and drag it out or replace it with another skill.

Advanced hotkeys: When you have leveled up enough where you don't have enough hotkeys for all of your skills, you can click on the little arrow in the upper right corner of the bar to reveal a second set of slots. (To get back to your original bar, click the arrow again.) These slots don't have any keys on your board set to them yet. Therefore, you need to set them by double clicking a slot. A little window comes up titled "Change Hotkey". From here, you want to assign the key by clicking on it on your keyboard, making it show up in the space. When you are happy with your hotkey, click "Set Hotkey" and drag the skill there to use it.