How do I find food?

Hello ^^

You don't "find" food as literally food. :)
Go to your stables, there's a "Feed Pets" button there.
You click it, pay gold and voila: all your pets are fed.
The more pets you have, the more you have to pay. Simple as that.

If you want to do it manually, you have to do it one pet at a time.
Go to your pet's profile page and there should also be a "Feed Sylesti" button
if the pet is hungry.

Once you advance in the game you will be able to hire a Stablehand that will do that for you.