Posted from my CrackBerry at wapforums.crackberry.com
Did you read the thread? There's a link to all the two letter country codes on the first page. All you need to do is put a * on both sides of the two letter code.
So go to the link that's on the first page of this thread. It has a huge list of all the two letter country codes. Scroll down the list to the "L's" and find Liberia. Right next to it is two letters.
You will do this in BBM *two letter code* hit space and the flag will appear.
I would tell you the two letter code, but this is so easy there's no reason why you can't do it.