Depends what format the weapons are in, basically go to the addons section of this forum, and when you find something you like, you will PROBABLY have to unzip it in your programfiles/blockland/addons folder but again, that depends on the format of the download (not really the format, but which files he included and how he zipped it)
if it doesn't go in your addons folder people will tell you where to put it, remember to read their posts.
be sure you have retail..those addons are for retail in case you didn't know.
