Tatsusalt

A friend of mine is using a shipping service, all she needs is to sign up for it but we can't find the site for it

Should be here - http://www.55-69.com/shu_login/guide-01.html and then accept till you reach https://55-69.fc-sys.com/entry.php

A Japanese helped me do to do it, but I think after filling in all the data, you should get an email and then you need to go to pay for the fee (to a family market, etc.) and then you get the confirmation and thats it.

Alright, thanksss