How do I recharge my Orange internet?

Excuse me, I'm having some trouble with my Orange internet connection and I was wondering if you could help me understand how to recharge it. I've tried a few things on my own but it seems like I'm missing a step or something. Could you please guide me through the process? I'm not very tech-savvy, so if you could keep the explanation simple, that would be greatly appreciated. Thank you in advance for your assistance.