Um help plz

Ok I have tried for ages to change my name at first (the first time I downloaded it) it let me choose my name but when I kept re downloading it....it made it to like ab18583929
And it didnt take me to the Login or sign up page!

I PRETTY SURE this isnt the real app )3

Lilylilaclover about Musically App - Lip Sync or Dance on Your Music Video