To convey a message, instruction or request to someone; 'to tell (someone) to', 'to say to (someone)'.
Long explanation:
The ~ように言う grammar point is used to convey a message, instruction or request to someone. It can be translated as 'to tell (someone) to' or 'to say to (someone)' in English. It is often used when the speaker is reporting something that they were told or when they themselves are instructing someone. The formation is attached to the verb stem.