You should read the Educator’s Guide, as well as all the other FAQ and support documents you can find.
Use the Forum search function and search for ‘student’, ‘class’, ‘eductor’, etc and take a look at the many, many conversations that are relevant to your question.
As a personal opinion, I think that the idea of getting students involved in iNat is good, but that bringing it into the classroom is often not a great idea. I am 100% against making students download apps and such, and there is a certain barrier to entry as well with that as not all students have the same level of access to the requisite technology even if making them downloading an app for class wasn’t already a questionable proposition.
iNat requires a certain level of responsibility, commitment, and follow-through from its users, making it potentially a poor choice for a class activity as participation becomes a requirement rather than a choice and for many people, particularly younger ones, when something is required the responsibility, interest, and commitment to follow-through is often lost.
In my opinion the best way would be to it into the classroom not as something students are required to use or participate in, but as a tool to discuss things like citizen science, the power of individual action social participation, etc (which parlays nicely into issues like political awareness and such), as well as subjects like biodiversity (being able to actually show them what people in the area area are finding), extinctions, conservation, importance of pollinators (transitions nicely into conversations about agriculture and such), etc, etc.
Don’t make students use it, but get them interested in the subjects that iNat is relevant to and let them choose for themselves if they want to participate on their own.
Once a week, or every other week have a check-in with the class to show them what’s new in the area, or pick different parts of the world to look at and discuss. No need to set up a project, use established Places, or simply use the AOI tool to draw a circle or rectangle on the map to use as the discussion area.
If you do want to set up a project place then do so and use that as the discussion area and let them know that there is a particular place the class will be monitoring over X amount of time, but don’t force them to go out, let that be their own choice and their own voyage of discovery.
If students want to get involved with iNat let it be their choice and you provide the information and trigger that gets them interested.