Hi,
Turn off your laptop and Remove the battery first!!
To remove a keyboard from an HP laptop, you need to remove the screws on the back panel on your laptop and then using a guitar pick (ifixit has one too if you wish to buy otherwise your local music store would have one - take a 0.5 mm pick) pry open your keyboard at its border lines.
Slide the pick across and under those lines and you can hear small sounds of something opening up. If the liquid is actually making your keyboard stick, just get the outer border open and then using pliers or even just your fingers, slowly pull at the keyboard (NOTE: Please make sure all edges are open!)
There will be a cable attaching your keyboard to the laptop which you can open by pulling the locking switch up.
I gave this answer elsewhere as well and it's funny, but use a hair-dryer or keep your laptop under a table lamp for a while to make the liquid evaporate. Please remove the battery while doing so.
Kill the static energy in your laptop by holding the power button for 20 seconds and then attach the keyboard and battery and fix the back panel and power on your laptop.
It should hopefully work now. Good luck!