This is supposed to help others on mobile. To feed the horse “equip” the carrot while looking at it. To see that you are looking at it a little blue and black thing will pop up. Then once its fed get close and look at the left upper corner of the screen and ride. Once it starts bucking tap the carrot in the corner of your screen. (A little side note: Keep jumping until it runs out of stamina. It becomes easier to take and more likely to not run into a Rex or something.)
A great travelling companion on many of the Ark maps. The Equus has a unique taming method, where you must walk up to it, feed it(their preferred food is Rockarrots), and ride it. The horse will attempt to buck you off, but when it does, press the prompted button and you will stay on and increase its taming percentage. You cannot control the horse while you are riding a wild one, so be sure to clear out the area you decide to tame it in.