Hi @Nancy299
You'll be able to review a guest after they check out.
Your reviews won't be visible on your listing before you have at least 3.
There are plenty of posts in here on the community pages so browse around and get your self familiar with all the aspects of hosting.
Search The Community: A Community Help Guide
The Help Center on the Airbnb platform is also usually very helpful.
How reviews work:
https://www.airbnb.com/help/article/13/how-do-reviews-work
Best of luck with hosting!