hi corsacrazy,
you will only need to set up a cronjob if you want the image created automatically every 15 minutes. Its not a must. Read the instructions corsacrazy. It does not tell how to do it exactly, because that goes beyond the scope I can offer, but it tells you alternatives if you do not have access to telnet or webmin or ssh to create you own cronjob.
greets
tina
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