A new fish tank setup had it going now for about 4 weeks tested water this morning.
pH 7.6
Ammonia 0.50
Nitrite 0.25
Nitrate 5.0
With these results is my tank ready to put fish in.
No it's not, you need 0 ammonia and 0 nitrite, consistently for a week. How are you dosing ammonia?
i had a different filter from a different tank and putting fish food in.
Like Al said, the filter needs to be processing 4ppm ammonia, and its consequent nitrite, to 0ppm in 12 hours. Have a read of
this article here. It gives detailed information on how to do it.
It's perfectly feasible to cycle a filter with fish food, but it's very very hard to control how much ammonia goes into the tank - too little, and you extend the time taken to complete - too much, and the wrong bacteria grow.
I'd recommend that you purchase some pure household ammonia, because it's so much easier (if rather smellier!). Whereabouts in the world are you?
Edit

Having seen your edit, I wouldn't change the water today, because you'll take away the bacteria's food source (the ammonia and nitrite).