Hi!
Is there any possibility to invite a user to answer a question? Like here, in Quora:
Yes, use the invite button on the topic.
You must be TL2 to send invites however.
Agree with Jeff, right now @Agnieszka_Jaskiewicz you have TL1 here on discourse.
When you get the TL2, you will see the “invite button” like:

Some off-topic points:
Regards!
Thanks! What do you mean with TL2? What are the next steps when a user gets a request to answer a question? Does he get an email or what?
Search “trust level howto”. Find Understanding user statuses, roles, and permissions
Nuestros usuarios obtienen TL2 de forma predeterminada. Me gustaría mantener la opción “invitar a responder” solo para administradores porque temo que los usuarios se envíen spam entre sí. ¿Cómo podemos habilitar esta opción desde TL3?