Step 1: craft a bola (2-5) and narcotics (20-30)(depends on level). Bring raw meat (kibble, raw prime meat, and mutton are best for taming).

Step 2: find a Pteranodon

Step 3: throw the bola

Step 4: knock it out with slingshot or fists (tranq arrows, toxicant arrow, and darts are best for torpor)

Step 5:put raw meat inside Pteranodons inventory. Maintain its torpor to more than half

Step 6:craft Pteranodon saddle (lvl 38 unlock) and put it on

Step 7: enjoy flying :)

(sorry if wrong grammar)