Where are you having an issue - have you tried following the video tutorial/walkthrough, or the step by step instructions with pictures listed in the OP? At what point in that process are you running into an issue.
“If you are new to scripting or have never used OFS before, i recommend to check out Husky’s video series How to script in OpenFunScripter - video tutorial . In Part 3 it explains the installation and usage of this extension. In addition, a step by step installation instruction with pictures is available on GitHub.”