Need help for a mod that I'm working on

I need help for a mod that I’m working on, just need to change the stats as shown from the picture. But I’m struggling to figure out how to it with all the tutorial I’ve seen so far. Can some help me with this ?

Can you show me what tutorial you’re watching? maybe I can explain it easier than him and briefly, then help you with the parts you don’t understand if you still don’t