When you create your signature (by entering your name, desired skill, and goal) and submit the form, the URL is created correctly, but not displayed correctly.
It comes up with the main host and folders correctly, however, at the end, it just displays ".png".
All the user has to do is enter their name before the ".png", but I figured I should report it.
If this has already been mentioned and I overlooked it, I apologize.
I believe that you've missed a step somewhere along the lines. Typically, when a user enters their credentials they just go down the line. I understand though how it could've been missed; I've done so on several occasions.
It's not an error; just make sure you've gone through each and every step on the page.