If you are using Microsoft MakeCode or CircuitPython, you'll need to do a couple of basic things to set things up.
For MakeCode
In Makecode, the editor is located at https://makecode.adafruit.com/
You will need to add the Crickit extensions. The Crickit Guide has the MakeCode information page to install this extension.
For CircuitPython
See this guide page from Introducing Adafruit Crickit on setting up your CircuitPython environment.
Adafruit suggests using the Mu editor to edit your code and have an interactive REPL in CircuitPython. You can learn about Mu and installation in this tutorial.
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