If you look at the cartridges of the CIS system, there are 'plastic arms' that lock the cartridges into place when you insert them into the printer. If these arms are not clicking into place, then the printer can not read them.
One trick to get them to lock into place is to use your right hand to push down on the cartridges, and use your left hand to CAREFULLY push on the plastic arms AWAY from you (towards the back of the printer). You should hear a pretty distinct 'click', which tells you that you inserted them correctly.
If you are still having problems, please e-mail us with your contact number and we'll give you a call to troubleshoot you over the phone. Hope that firstname.lastname@example.org
CisInks Customer Service Team