To install the appstore app, right-click on your turtle to open the GUI, run
pastebin get iXRkjNsG appstore. To install hellofunction, run
appstore get AlSweigart hellofunction.
A programming demonstration of calling a function.
This program is used in Chapter 7 of Coding with Minecraft. You can view it at https://turtleappstore.com/book/chapter7.html