A misplaced modifier is a word, phrase, or clause that is not placed close enough to the word it describes to be clear.
Confusing: The waitress served ice cream to everyone in bowls.
Wow! Everyone had to get in bowls in order to get their ice cream?
To fix, place the modifier as close to the words it modifies as possible.
Better: The waitress served ice cream in bowls to everyone.
Sentences like this are common in conversation. But they are imprecise. So they have no place in your fiction.
Note: misplaced modifiers can be hard to find in revision. Why? Because you, the writer, already know what you’re trying to say. Your mind “sees” what you intend to say. The reader, however, does not want to do your job.