Thank you, Brynn!
Actually I followed a tutorial back then and no, I cannot change the logo now since I don't own the group.
Since then I have learned so much more and if I should redo it today it would be a lot different.
It seems as if the group is happy about what I made back then though

This was the tutorial I followed:
https://www.youtube.com/watch?v=hDY8TKCEV6w