Pick it with your skiff, drop it in a stone box. Knock out at your leisure and use regular kibble. Only tame two, get good levels opposite gender and breed from there on out, unless an event gives good colours then get a low level colourful one to introduce into your breeding line.
You will need: icthy with saddle, A nearby leed, a pteranodon with saddle, a carno that you want to tame and (preferably nearby, so your prime meat doesn't rot) 20-25 tranq arrows and a bow. Step 1: After locating a nearby carno hop on your icthy. Step 2: keep scraping meat off your leed, until you get prime fish meat. Step 3: Get your tranq arrows and bow, and fly until you find your carno, and then land on a high rock. Step 4: Get the carno's attention, and get it stuck between two trees. Step 5: hit it with tranq arrows until it's unconsious. Step 6: Give the carno the prime fish meat, and wait. Step 7: Think of a name for your carno while its taming. Suggestions: Toro, Hot Dog, Lil arms and name it according to its colour. ( Moss, Sea foam, Blaze etc.) Step 8: Once its tamed, make sure no dangerous creatures are nearby.(rex, spino, allo pack, etc) Step 9: Hop on your pteranodon, and if the rock is too high request it. Fly back to your base. Step 10: request your carno and name it. Step 11: Congrats! You tamed a carno!