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````{tab} Linux
[type this into your terminal]
```
nano config/config.yml
```
I’m using `nano` here mostly because it’s simpler than any other editor on Linux.
If you see something like:
```bash
$ nano config/config.yml
zsh: command not found: nano
```
You need to install `nano`, which you would do with:
[type this into your terminal]
```
sudo apt install nano
```
You can use any other text editor you wish, provided it saves files as PLAIN TEXT. `vi`, `emacs`, etc.
````
````{tab} OS X
[type this into your terminal]
```
nano config/config.yml
```
I’m using `nano` here simply because it’s built into OSX. You can use any other text editor you wish, provided it saves files as PLAIN TEXT. BBedit, TextMate, VSCode, etc.
A common mistake is using TextEdit.app, which saves files as RTF by default.
````
````{tab} Windows
[type this into your terminal]
```
notepad .\config\config.yml
```
I’m using `notepad` here simply because it’s built into Windows. You can use any other text editor you wish, provided it saves files as PLAIN TEXT.
````
From here on in, when this walkthrough says "open the config file", I mean this `nano` or `notepad` command. **Don't copy the template again**.
