Setting up SSH for WSL using Ubuntu, but can't edit ssd_config file with VSCode WSL2 window. It won't save - "operation not permitted"?

Question

I'm following these instructions to set up LAMP on WSL. I got to step 3, and made the edits it instructed after "Make these edits:". However, after editing sshd_config using VSCode (in a WSL-2 window, which I figured might matter), I'm unable to save it and continue with the instructions.

VSCode first gives me this error popup when I try to save: Failed to save 'sshd_config': Insufficient permissions. Select 'Retry as Admin' to retry as administrator.

And when I select "Retry as Admin", it gives another: Failed to save 'sshd_config': Command failed: "C:\Users\smith\AppData\Local\Programs\Microsoft VS Code\bin\code.cmd" --file-write "c:\Users\smith\AppData\Roaming\Code\code-elevated-BmAuYzjZ" "\\wsl.localhost\Ubuntu\etc\ssh\sshd_config" Error using --file-write: EPERM: operation not permitted, open '\\wsl.localhost\Ubuntu\etc\ssh\sshd_config'

What do I need to do to be able to use VSCode to make the edits to this file? I don't want to be locked into only being able to use Nano for this or any project, so I'd be very thankful for some guidance.

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UPDATE: I think I've made a little headway! I tried following this similar tutorial, but on this step, trying to add this file, I get an error. I think I'm lacking some kind of permission to change WSL files in Explorer at all. I'll try to figure out how to do this before going further, and I'll report back if I'm successful.