Digital BW, The Print

My first post to this group although I have been learning a lot the 
last few months by reading the posts here. I'm just diving into b/w 
digital printing after many years of printing my own large format b/w 
stuff in my home darkroom. For my first digital setup I decided to go 
for an Epson 1400 loaded with MIS Eboni 6 inks. 

I've now got the printer and have loaded the inks. All seems to be 
working OK - Except - no ink is being put onto the paper while the 
printer is printing! There were no instructions of any kind included 
with the Eboni 6 inkset, so I am assuming those little colored plastic 
tabs on the back of the individual cartridges need to be removed or 
moved to another position before the ink can squirt out of the 
cartridges? The only previous experience I have with printer cartidges 
are the standard Epson product, where one just pushes them into the 
slot and begins printing.

Any help for this raw beginner will be much appreciated!

Rob McKay