in‧struc‧tion S3 W2
the written information that tells you how to do or use something [↪ directions]:
Install the machine according to the manufacturer's instructions.
Press enter and follow the on-screen instructions.
instructions on (how to do) something
Are there any instructions on how to plant the trees?
instruction book/manual/leaflet etc! Do not say 'instructions how to do something' or 'instructions to do something'. Say instructions on how to do something.
Read the instruction book carefully.
2 [countable usually plural]
a statement telling someone what they must do [↪ orders]
on somebody's instructions (=having been told by someone to do something)
On the landlord's instructions, the barmaid refused to serve him.
My instructions are (=I have been told) to give the package to him personally.
Make sure you carry out the doctor's instructions.
be under instruction to do something (=have been told to do something)
The police were under instruction to fire if necessary.