This one has no email-account included, so it´s not possible to change your account credentials, unfortunately.
I now see that they also wrote that in the item description, so just be aware of this fact, before buying.
Also it seems not to be possible to family share the account, at least it did not work for me. It might be a restriction of the game itself (Squad).
For the price I am content, though.
This works fine for me, for a very good price.