Edit public profile username

Hello everyone!

Today I had a problem with my account, I was looking for a suitable name for my username, and with every username I tried the system told me that the username already exists, but when it found an available one it directly changed the username without asking me if I was sure to make the change! I think, considering that you can only change the username three times a year, the form should have a confirmation alert when it finds an available username and not save directly.