How do I navigate to librealsense root directory?

[FWhit2]

I am trying to implement Intel’s Realsense D435 Camera with my Raspberry Pi Model B but I am running into problems as I try to install the files necessary on Ubuntu. Because this is my first time working with the Raspberry Pi, I may be making amateur mistakes, so please bear with me. I have recently updated Ubuntu distribution on the prerequisites section, but I don’t understand how to navigate to librealsense root directory. I tried skipping that step before and simply writing the code that follows, but it results in various errors. Thank you for your support!

Here are the instructions that I am following: https://github.com/IntelRealSense/librealsense/blob/master/doc/installation.md

[MartyG · Accepted solution]

Someone else has previously asked this question. The reply of an Intel support agent was this:

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Regarding your question "What does navigate to the librealsense root directory means?" ... navigate means just to run the command cd librealsense