Quick answer
Click your name in the top right to switch to a different Moodle role.

Full answer
To check how your students will see a site, you can switch to “student” role. Please note that this is an approximation of what a student sees (your “lecturer” privileges mean you can’t see exactly what they may see). To do this:

• Click on your name (top right of the screen).
• Click “Switch role to…”
• Select any of the roles available in the list.
• Your name at the top right should display the role you are currently using.