Never used the stuff. how much and when and how?
Doing a quick search on this forum, I found this quote from bluesman:
Here’s my method for 5 gallons of beer.
- add 1 tsp gelatin to 8oz (cold water)
- let stand for 30 min.
- microwave until you see the first bubble (then stop microwave)
- chill to 40F
- add to chilled and kegged beer and gently stir.
- allow 24 hrs to settle
- force carbonate beer
- blow out gelatin sediment and serve beer
just use plain old Knox unflavored Gelatin?
Unless you like lime flavored beer! 
No need to buy anything more expensive. Knox works great.
You don’t have to be kegging, either. You can add it to the fermenter before bottling or kegging and wait a day for it to clear, plus there’s another thread here (search gelatin) where somebody was adding it to the bottling bucket.
When adding to the keg or fermenter it helps if the beer is much colder than the gelatin. This way is starts on top and slowly sinks to the bottom taking all the haze with it.
I was reading this thinking…this is exactly what I do. ;D
Works great!
Can I add it to my Corona clone? 
Maybe I should clear my flanders with some cherry jello 
My process is even simpler, FWIW.
• Fill liquid measuring cup with 1 cup water
• Microwave on high until very hot, but NOT boiling (around 150-160 F)
• Add 1 tsp gelatin to hot water and mix thoroughly until completely dissolved (it will take about 10 minutes)
• Add gelatin/water solution directly to keg
• Put keg top back on, purge O2, and shake to mix in gelatin solution
• Wait 3-4 days
• Pour clear beer
edit: make sure your beer is cold before adding the gelatin
Step #4 you chill the beer or gelatine?
I put hot gelatine into the cold beer.
Works just fine.
I chill the gelatin before adding to the beer. YMMV
I put the hot gelatin into the cold beer as well. Gets it to diffuse across the surface of the cold beer. No stirring necessary.
Is it bad to start force carbonating before letting it settle 24 hours? I add it to the keg, rack on top of it, seal and pressurize the lid, shake a bit, then hook it up to start carbonating.
From my experience… I’ve had alot of success with using gelatin immediatey upon kegging and force carbonating. I should add that my beer has already been cold crashed in the primary so it is chilled going into the keg.
Nah… I usually rack into the keg and put it on pressure to start carbing, but don’t add the gelatin until a day later once the beer is cold. Then I just continue carbing until it’s done, blow out all the crud with the first pint or two, and have nice, clear beer.
That’s exactly what I do. Although, I probably shouldn’t use the present tense since I don’t really use gelatin anymore. 
Sound advice Mark.
However I may add that if the beer has been cold crashed it can be fined immediately after racking into the keg and force carbonated. This is my current SOP.