My Experience With Niffler Exchange

I sterdet to try niffler exchange platform. It is aim is to learn making exchange. However, when I wanted to use with my existing username, I received a message "name ozgurcinarli already exists". So I singned up with username ozgurcinarli1. I took a screenshot to show you here , but I can't upload it. I received "unable to contact server" message. I think today is not my lucky day.