Answer:
úsala
Step-by-step explanation:
Laura: ¿Puedo usar tu computadora portátil?
Eva: Sí, claro, ¡úsala!
Translation:
Laura: Can I use your laptop?
Eva: Yes, of course, use it!
In this case the verb is used followed by the preposition "the". The conjugation of the verb is for a person in the singular (who is the one who asks) and in the present tense.