In your messages or SMS/MMS folder, simply move the cursor over the MMS you want to forward so that it is "highlighted" so to speak and hit the menu button and there should be an option to forward
I wonder if anybody can help, i have just got a blackberry curve 9300 3G, i am tring to forward on a tet message but it does not give me the option too, i can forwrd on emails etc but not messages for some reason. I wonder if anybody has got the same phone if they can help