You should have been given instructions about this with your turf as most are pre treated/fed and do not need feeding again this year. Give your supplier a ring and find out what was done etc.

Hi, welcome to GoY, as Drc says it shouldn't need feeding this year, and lawns in general are usually fed in spring, this can be a weed/feed, and moss killer if necessary, an then an autumn feed, they don't usually get a feed every other week or so, loke some plants, if it starts to look a little pale green, you could give it a feed of high nitrogen fertilizer, just to green it up a bit, but if the ground is fertile and well prepared, this shouldn't be required, Derek.