God I hope this isn't a stupid question to ask but how exactly do I send out cash? Do i need to add a return address and won't that defeat the purpose? I really just want to try the service for 2-3 months after that I'll probably switch over to the amazon vouchers since I don't want to deal with monero. I think I sent out an actual physical letter maybe twice in my life and all the research I done was for sending it out internationally even though there's a us based address AFAIK so I'm really a noob here and I appreciate any help you can provide.

Edit: Just want to apologize if this is really stupid to ask I feel like an absolute idiot right now, haha

Edit #2: Thank you all for your help think I got an understanding on what to do now