You'll probably get more answers if you post this in Managing Your Flock.
If your chicken is old enough to lay eggs, buy a big old bag of layer feed - I'd go organic. Roosters can eat it as well. You can supplement its food with yogurt, greens, scrambled egg, bugs, etc.
Do you only have one chicken? Chickens really need company. Find yourself another chicken! Or better still, two
Check to make sure you're posting in the right section - you'll get a lot more responses to your questions, plus the moderators may move your thread if it's posted in the wrong area. Also, you might try the search bar on BYC. There are many old threads that cover any questions you might have. It helps also to give enough information when posting, such as how old your chickens are, what your situation is.
Hope you're enjoying your chickens! They are lots of fun and will give you great eggs.
hens that are laying eggs get layer feed. roosters can eat it to.
chicks need chick starter till they are laying or for roos i usually switch feed at 7 months old