Digital BW, The Print

Hello I am converting my EPSON stylus photo 2000P into BW.
I have bought the MIS BW inkset (EBONI6) from www.inksupply.com.

Upon trying the color TO16 refillable cartridge from inksupply I 
observed that there are no clearly shown breathing/venting plugs. The 
cartridge, although recognized by the printer, wont print.

After inspecting the cartridge closer I was able to see some type of plugs that were difficult to remove located close to the refilling ports. These seemed to be the breathing/venting plugs which I removed.
Unfortunately there was ink spillage all over the place while printing.

A picture of the kit is shown at 
http://www.inksupply.com/product-details.cfm?pn=REF-15/16-6-KIT
(I have the MIS BW inks instead of the color ones otherwise the kit is the same).

Could anyone kindly help me on how to use the TO16 refillable cartridge from inksupply (needless to say the company did not reply to my enquiry)