Hello and welcome!
Afaik, with funscript.io you can’t create scripts.
But we have several tutorials on how to create scripts in the howto section.
- Slibowitz’ how to script video tutorial series - Episode 1 - Cowgirl and Reverse Cowgirl - howto - EroScripts
- How to script in OpenFunScripter - video tutorial - howto - EroScripts
- How to get started with scripting - howto - EroScripts
I hope this helps!