On my LMS (i.e. my course page on Canvas, Moodle, etc.)
To help students familiarize themselves with the app, it is advisable to include a link to the instructions for students on the course page of the LMS (or on a screen in the classroom). There the students will find all the important information from downloading the app to an explanation of all its functionalities.
In the classroom or lecture hall
It is worth taking the time to briefly introduce Brian in the first lesson.
It is best to go over the instructions for downloading together with the students, ask them to download the app immediately (whether on the tablets provided by the teaching institution or on their personal smartphones), and log in together. This way, in under 10 minutes, everyone will be oriented and ready to use Brian for learning.