Close Tinderbox, open the folder where it is stored (default is /Applications/) and drag the app to the Trash. Supporting files will be found in
Tinderbox user dictionary
Check, especially If you have installed custom configuration files, and remove the folder and its contents at:
If you have installed the app at a global level (for all accounts) you may need to check:
Any support files in these locations may deleted (or archived off elsewhere).