There are two product that Respondus has for assisting with the effective delivery of exams, Lockdown Browser & Respondus Monitor.
Respondus Lockdown Browser
https://web.respondus.com/he/lockdownbrowser/resources/ - here you will find student and instructor quickstart guides as well as resources for effectively using the Lockdown Browser to assist the delivery of your exams.
Respondus Monitor
https://web.respondus.com/he/monitor/resources/ - quickstart guides and more information about he technical setup of Respondus Monitor.
Link for Students to Test Lockdown Browser
Lockdown Browser Test (not Respondus Monitor) - direct students here so that they can install and test Lockdown Browser ahead of a quiz or exam. You can embed this in your course and ask students to verify their setup ahead of an exam.
Link for Students to Test Lockdown Browser & Respondus Monitor
Lockdown Browser and Respondus Monitor Test - direct students who will be testing Lockdown Browser and Respondus Monitor here. This will allow students to test their camera and system setup before using Respondus Monitor for an exam.