How do I refill my ink cartridge?

I bought the inc and all the stuff to refill cartridge for my printer but now I am not sure how to do it.


Its a HP Photosmart C3100 series printer, HP Black Print Cartridge 92.


Any suggestions would be appreciated.How do I refill my ink cartridge?
u can refill it and there are many videos on youtube that teach u how


here is 1 of them:


http://www.youtube.com/watch?v=ayschOFzwP4How do I refill my ink cartridge?
Two problems


Printer manufacturer's don't want you refilling their cartridges so they make it as difficult as possible


Even if you manage it, the printer is unable to detect the amount of ink in the refilled cartridge so you might well run out of ink unexpectedly