Action Bars

Action Bars are an exclusive widget found only in the Flash Client. You can have from 0 to 4 and they are displayed on the four sides of the Game Window. The arrow in the image on the right side of the bar (highlighted in purple) can expand or collapse the bar. Each bar has 30 slots available which can be used to auto-send text, a Spell, or use an Item. Click the arrows at end either end of the bar to scroll through the slots (highlighted in purple at top and bottom). You can just click on a slot to send text (i.e. "Hello!"), do a spell (i.e. Avalanche), or use an item (i.e. HMM), but you can also assign a slot to a hotkey.

Add text or a spell
Right-click on any slot and select 'edit'. There are two radio buttons: The first button is already selected. You can enter any text, for example you might want to have, "hi trade bye". You could also have the words to a spell in this field.

You can select the second button to add an Instant Spell (you can only select one: text or spell). Then you can click on a drop-down menu for an alphabetical list of all spells for all vocations, with pictures.

To clear a slot just right-click and select 'delete'.

Add an item
To add an item just drag and drop it from your inventory or anywhere onto a slot. A menu opens and you can choose to use the item on yourself, use on a target, or use with crosshairs (just like normally assigning an item to hotkeys).

Assign slots to hotkeys
You have to open up hotkeys first (traditionally ctrl+K) or go through the General Controls: Options > Hotkeys. Scroll down past the 51 presets and there are 30 keys for each Action Bar. They are labeled T1-T30, R1-R30, B1-B30, L1-L30 (Top, Right, Bottom, Left).

Click on the field under 'First Key' or 'Second Key'. If the key is already assigned the text will become bold, click again and it becomes italic, then press the key/combo you want to assign. If the key has not been assigned yet then slot is empty and when you first click, it will then say   in bold, click again and it becomes italic  , then press the key/combo you want to assign it.