You can buy granular stabilizer at the pool store. There's liquid stuff as well but I've never used it and have no experience with it.
Calculate how much CYA you have to add to your volume of water to get the concentration you want. You can use the Pool Calculator to do that. Because I prefer to go slow with chemical additions I recommend to add 1/2 the amount at first, wait a few days, test, and add more if needed. CYA granules are slow to dissolve, hence the wait. Keep adding bleach while you're waiting for the CYA level to rise.
Many people prefer to put the granules in an old sock and hang it in front of a return to help it dissolve. I put mine in the skimmer basket and let it get sucked into the sand filter. I then don't backwash for several days while the compound is dissolving inside the filter.
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