Think of a way--? [Somewhat confused for a moment, until she comes to the conclusion it's that he doesn't know how to make private calls] This trigger will allow one to contact a single person privately instead of publicly.
[Pointing to said button on her own device, she informs him straight-forwardly, bluntly, and absolutely without any sense of being condescending or even a hint of distaste for the mention of Lina. She's being helpful with something he needs!]