Miracle Glue is best stored in the refrigerator. That will give you the best shelf life. Use Miracle Glue at room temperature for best results. If you are not going to keep the glue in the fridge it is best to keep it in a cool dark place. It generally will not last as long this way but is better than keeping it in the kitchen window in the sun in the middle of summer.
After you have used the glue and before you put the cap back on gently squeeze the bottle to clear the spout of glue. Then wipe off any wet glue from the threads and spout. You don’t need to screw the bottle lid on too tightly – just snug. Store it upright – place it in a cup or something similar in the fridge so that it doesn’t fall over.
More information on general instructions is found here.