Use OBS or FFmpeg to push your stream:
RTMP URL: rtmp://rtmp.livega9.online:1935/live
Stream Key: mystream (or any name you want)
HLS Playback: https://stream.livega9.online/hls/mystream.m3u8
FFmpeg example:
ffmpeg -re -i video.mp4 -c:v libx264 -preset veryfast -c:a aac -f flv rtmp://rtmp.livega9.online:1935/live/mystream