Code:
on *:text:!joinqueue *:#: { 
if ($read(list.txt,nw,$2)) { msg $chan You're already in the queue. | return }
else write list.txt $2 
msg $chan $2 has been added to the queue!
}
You just change $3 to $2. $3 meaning the third word a user puts. So for instance:
$1 !joinqueue $2 userid $3 blank

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