Have set up a Calendar Module and have already entered events.... but am having difficulty understanding how this all works

Need specific instructions, please.... so that once I have this set up, my client will be able to make modifications to the calendar himself.
http://t3ch-2-sp3c.com/CMSSimple/admin/ ... e=Calendar
http://t3ch-2-sp3c.com/CMSSimple/ (home page)
Thank you!