How to change profile in Sony ericsson mix walkman phone

I have sony ericsson mix walkman phone and I am unable to find way to change profile in this phone and hence I am facing problem in using this phone.

I had purchased this phone last year and It is working fine but I am still not able to figure out how do I swap profile in it for my personalization.

In settings --> General you can find option for profile I think .

let me know if I am correct . :)