Hi
For this model, I believe, access to the cartridge carrier is by lifting top panel backwards holding the slots on either side, beneath the control panel level. The Brother control program should guide you through centering the cartridge carrier and the replacement cartridge installation process.
I assume you don't have a manual.
Download the manual in PDF format from the top right corner of this webpage:
http://www.brother-usa.com/mfc/modeldetail.aspx?PRODUCTID=MFC7840W
I hope this helps.
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