This post lacks a lot of information, but you need to shock with chlorine. To do this right you will need a good test kit, Wal-Mart sells a 6 way drop based kit for under $20 that will do in a pinch. Making a few halfway sane assumptions on your current situation, if this is a seasonal pool and has been in use for a couple of months using tri-chlor pucks to chlorination chances are your CYA level is around 40-50 ppm, you will need to add about 2 gallons of bleach to bring to shock level, and an unknown amount to keep you there. If you have been using only liquid chlorine or bleach with an initial dose of stabilizer you may need less, if you have used a lot of dichlor shock this season you may need more.
With all that in mind I would suggest you start by adding about 2 gallons of 6% bleach to the water ASAP (it is about sunrise here, ever hour of sun on the pool without chlorine in it and things will get worse)
If you have a good test kit post your numbers here and we can work from there
If not get one, but go ahead and get the chlorine level up now.
If getting a test kit is not an option today, I would start with 2 gallons of bleach, add another half gallon about mid day, if it is not looking better by the end of the day add another gallon then. (this is going blind, but best guess.)
Ike
p.s. keep everyone out of the pool while shocking, and read up on pool school
p.p.s. after seeing the attachment photos, I suspect you will need even more bleach than my blind suggestion, maybe start with 2 gallons, and add another gallon after 4-6 hours, and again at the end of the day if you have seen no change to color (it will likely turn brown or gray before it gets better, after color change it is a matter of time before your filter removes the dead algae, keep the filter on 24x7 until then and clean/backwash it frequently.)