Feeding times for the afternoon are 2, 3, and 5pm.
It's $4 for 4 fish in a paper cup. You can buy as many as you want. When they sell out, they close the window. I'd suggest 3 cups. Tons of people form along the wall, 3 levels deep. Get there 15 minutes before the window opens. Have another person stake out a spot along the wall. The dolphins will come up to everyone with food and stop so you can pet them. The people standing next to the person with food will also be able to pet them. If you hold your hand up like an officer telling someone to stop, they will raise up out of the water and touch it, that's when you toss the fish in their mouth.
After the window closes, people run out of fish to feed, and the dolphins go back to playing.
At 3pm, a trainer comes out with a big bucket of fish for certain dolphins on a special diet. If you stand next to him, you get extra petting. But this happens fast, you have to know he's coming and and look for him.
If you're a really big fan, then you'll hang out and wait for the next feeding.
I bet you'll end up staying for two feedings. On a previous trip, my daughter and I did the 2pm, 3pm, went underground where you can see them behind a glass wall, then did the 5pm.