I figured it out on my own. I still need to create an account on BULL Bitcoin. Also, I need to verify my email and phone number. After that, if you have satoshis in your Bitcoin Jungle wallet balance, you can transfer them by clicking the Sell Bitcoin button. I saw this in your video. So it's like you sold bitcoin to the seller's phone number. I just did the same, paid a minimum of 2000 local coins. Just for testing, I sent it as a gift to the woman in the video.
