How do I make a one-time purchase with Bitcoin through Cash App

[Cmor5150]

Hi Bitcoin Community,
    This may sound like a ridiculous question... but I am a COMPLETE NEWBIE to Bitcoin. I recently inquired about making a purchase from a seller who only accepts Bitcoin. I need a step by step guide on how to complete this purchase. He said once I make I place my order he will send me an “address” for where to send the payment. Then he suggested I use I use  Cash App. How do I send a specified amount of bitcoin through Cash App? I know i can purchase a “partial” Bitcoin for payment... but once he sends me his “address” what do I do? If someone can give me a guide, I’d be most grateful. I am afraid I am going to do something wrong and lose my money!! Any help or guidance is greatly appreciated!   -cmor5150

[BitMaxz]

Why not follow the guide provided on cash app under help support?

Here's the guide that you can follow below.

- https://cash.app/help/us/en-us/3106-bitcoin-withdrawal-instructions

Make sure you already have Bitcoin balance before you send/withdraw the bitcoin from your cash app.

Just added this video to follow the guide https://www.youtube.com/watch?v=gG06FPfqrcA