Easy detailed tame guide:

-Craft rat treat kibble in cooking pot or industrial cooker

-Gather a minimum of 10 looted items (e.g. primitive parasaur saddle from white beacon or Ascendant pike from red beacon - It can literally be ANYTHING but the higher quality loot gives better tame %)

-Locate helicoprion and drop a single looted item in its vicinity.

- Interact/mount the helicoprion - it will them give you buttons/keys to press. Successfully completing 9 of the prompts/button presses will begin the taming progress and kick you off the helicoprion.

-Repeat this until the helicoprion is tamed.

Pro tip: clear out aggressive wild dinos in the vicinity of the Helicoprion you want to tame - Thank me later