Triple Berry Jam
Start out by filling your water canner half to 3/4 full of water. Then bring it to a simmer.
I also like to put the jars I am about to use in the dishwasher before hand, so they are sterile and hot when it's time to can them.
Then pour them into hot jars, leaving 1/4 inch head space. Wipe the rim and threads with a clean wet cloth. Put on the new canning lid and screw the band on tightly. Usually I keep the new lids in a small pan of boiling water to sanitize it before screwing it on, but honestly lately I haven't.