just type the word weed in between two colons like this: *weed* but with colons instead of asterisks
there's an link 'emoticons' at the bottom right of the message boxes. just click on it and a big list will open up of all the different pics. also, if you see a pic you like in someone else's message, you can hover the mouse over it and it should tell you what you need to type to get that pic