Add information on how to obtain the token

listunserv.sh

 #!/bin/sh
 LIST="KULSTUD"
 LOGIN_TOKEN=""
+# token can be obtained from https://ls.kuleuven.be/cgi-bin/wa?INDEX
+# log in and if necessary create a new password
+# after login the token should be in the URL or in the URL of any link you click on (it is what comes after 'X=')
 LOGIN_USER="voornaam.achternaam@student.kuleuven.be"
 REALNAME="Voornaam+Achternaam"