type /macro or go to the main menu (options and logout) and click "macros" to open the dialogue.
Create a new macro and pick a texture for it. In the macro put your message exactly how you would type it into the chatbox. "/2 Zippot's Enchanting: Fiery/Icy/Crusader/4dmg 100hp/mana..." Drag the macro to an action button and click it every 3-5 minutes.
Pretty straightforward.