So, you should contact us and provide listed information
Screenshots of your problem, or video if needed.
Screenshot of console (look below for more)
What step by step happens and how to repeat it if possible.
How do you play, Client or Browser? (better provide screens)
Your ID, Nickname of skin, IP, Time and Server (or Site) where problem occured. Send as text, not image.
Your IP: (look here showmyip.com)
Example
error-screenshot.png
console-screenshot.png
ID 4, skin anus, server ms5k1, today 20 minutes ago. IP 123.123.123.123
my skin does not load, other players do not see it too.
F12 > Console > Screenshot (ptr scr on keyboard)
Just few clicks.