Put carrots in last slot feed equus once from behind then jump on.. there's a icon on the side of the screen that will light up and let you know when to hit Y on Xbox to feed tame you keep doing that until it's yours simple tame..
Run run run, crouch when close still approaching at an angle, when close enough,(stack of carrots in zero slot) click three “e” three times; one to feed, one to mount, one to start THE RIDE! Each time you get the feed prompt, hit “e” and pray it gets stuck in a corner and doesn’t run off a cliff, or into carnivores. Ignore everything but the prompt, hitting “e” without hesitation. (You cannot control the run at all). That’s it.