Idiomatic expressions often have fixed prepositions. It is important to learn the entire phrase, such as 'to have no use for something', as a single unit.
Step 1: Recognize that the phrase "have no use..." is part of a common idiom.
Step 2: Recall the correct structure of the idiom. The expression 'to have a use for something' or 'to have no use for something' means that something is or is not useful to a person.
Step 3: Apply the correct preposition. The idiom requires the preposition 'for'. The correct sentence is "I have no use for it."