Yes you will need your computer with a web browser to change the settings on P186 - specifically the program mode in radio settings.
You need reach both both RRC units using a web browser from your your PC. If you're unsure about how to do that ask your IT guys.
Also, there are important sections of the manual that you must understand because they will help you with the RRC setup.
1. Step by Step system setup
2. Configuration with Microbit setup manager
3. Initial IP setup via USB (will help you find the IP addresses of your RRC's)
4. Configuration with WEB-Interface (The radio settings will help you with the detail on P186)