The blue arrow in the first image denotes the Save button in your G-Code Editor.
Select the Save button and save the G-code script as "Test.Square" so you can return to it and reference the script later.
The red arrow in the first image indicates the New Text button in your G-Code Editor.
Before you work with a new file of any type, make sure you've already saved your current script in the G-Code Editor. Any current script will be overwritten upon loading a new file. Use the New Text button to clear out any code in your G-Code Editor when manually writing your own.
To load a new G-code file, select the Load button from the top left corner of your BoXZY Interface (indicated by the green arrow in the second image) and locate the file. This button is used in later guides to open other types of files.
Insert a new line below
Insert a new line above
Indent current line
Unindent current line
Delete current line
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Navigate to previous step.