Hi Calligula,
You are just in time for this stuff.
First of all, I really recommend to decode CW manually by ears or eyes.
The user who decoded your mentioned observation probably used ocenaudio.
Please check this how to to decode and upload CW beacons.
Let me know if you’re okay with that.
And, the observation mentioned at the beginning of your comment has too weak signals.
Just start with this observation to have a sense of achievement.
Daniel