string uuid = "d01540d0-30c1-d4da-400e-af511dd25c12"; //Put your group's UUID in here.
string groupName = "Aberrant Anomalies Updates"; //Put your group's name in here.

default
{
    touch_start(integer total_number)
    {
        llSay(0, "Open chat and click this link to join " + groupName + ": secondlife:///app/group/" + uuid + "/about");
    }
}