Setting up developer in teams

[PKeller80]

How do I set up developer in Teams?  I would like to test new items before they are released.  My small credit union is starting to use Teams more and more.  Thank you. 

[#2]

Carefully follow the instructions here: https://docs.microsoft.com/en-us/microsoftteams/platform/concepts/build-and-test/prepare-your-o365-t...

[#3]

@PKeller80 , Addition to what @EddieLotter provided - here goes some sample code to try out. Let me know if you face any problem.