I imagine you are referring to this test question using the verb "acostarse" in the imperative for tú:
¡Acuéstate temprano! (Go to bed early!)
The pronoun that we are using is the "reflexive pronoun" and it's placed at the end (stuck to the verb) as explained in the lesson. You still need to conjugate the verb in the imperative form (affirmative command): acuesta; and then add the reflexive pronoun for tú: acuéstate
I hope this clarified it.
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Test your Spanish to the CEFR standard