Idk if this would work but to tame a tapejara you'll need full ghillesute, tranqdarts or tranqarrows, biotoxin or narcotic,bolas, if on console then rare flower, and allo kibble prime meat or normal meat.

Hope these steps help because I failed using these steps.

First: find tapejara.

Second: equipt full ghillesute.

Third: prone.

Fourth: bola tapejara or if on console then agro with rare flower then bola.

Fifth: knock out tapejara with tranqdarts or tranqarrows.

Sixth: feed prime meat or normal or allo kibble.

Seventh: feed narcotic or biotoxin regularly.

Eighth: enjoy your tapejara.

Tip: you can get tapejara saddle from completeing the prisute thin air.

Hope the tips help:) .Like I said I failed using this method.