Yes, yI- is an imperative prefix. It can be used to command a single entity to do something in general or to command one more more entities to do something to a single thing that isn't me. There are other imperative prefixes which you'll encounter in the course.
Be careful not to vary your capitalization. The word qet is run. There is no known Klingon word Qet. The capital Q is a different sound than the lowercase q.