The word 'instruction' is correct and usable in written English. You can use it when you need to refer to a set of guidelines or information on how to do something, or when passing on advice or directing someone to do something. For example: "The instruction manual provides detailed instructions on how to assemble the furniture.".
More frightening still, some took this as an instruction manual.
So what goes into a sex toy instruction manual, and who writes these things anyway?
Refer to your service manual for precise instructions on removing your ignition coil.
Read the factory Service manual for details.
Buy a service manual for your vehicle.
This will override that instruction for this single manual archive.
Read the instruction or operator's manual for your sprayer.
Being a terminologist, I care about word choice. Ludwig simply helps me pick the best words for any translation. Five stars!
Maria Pia Montoro
Terminologist and Q/A Analyst @ Translation Centre for the Bodies of the European Union