After creating it’s preferred food in cooking pot (10 ammonite bile, 4 tuso tentacles, and 6 bee honey) put in last slot in inventory to feed passively.

Bring a few premade ascendent items (higher the quality, shorter the ride) toss out one item near it, it’ll then go to eat. When it eats item go up and mount it to start rodeo, it’ll then ask you to press a button (typically a direction on d-pad for controller players). Once it is tired, option to feed will pop up. Feed it, it’ll knock you off. Avoid for a little bit, then throw out another item to start again. Continue till tamed. Took 3 preferred food to tame lvl 60 on x2