Canon i 950 - Manual (Page 5)

8. Slide the cartridge back and forth from left to right several times; make sure the tubes
not too tight when cartridge is in the far right and left position.
9. Open the upper cap of the Reservoir bottle as the below picture shown.
Now everything is put together! Double check your cartridge; then turn on the
power. Watch for anything unusual. You are ready to start printing.