How to assign teacher role to new user in moodle?

I created a **new user** in a **moodle** site and I want to assign **teacher role** to this user. I tried to achieve this using the below steps: 1. Site administration. 2. User. 3. Define role. These steps couldn't help me to solve this problem, and I see this page: [Assign roles – MoodleDocs](http://docs.moodle.org/25/en/Assign_roles). Can anyone help me to do that...