Https://panel.dreamhost.com/id/

When I logged to “https://panel.dreamhost.com/id/” I see " Welcome, monhan1", also when I received email from dreamhost I see this user, how can I change that.

As far as I know you can’t. As you might have noticed its character combinations involving your name.

Correct — we use your WebID as an internal identifier within our system, so it cannot be changed.

Thank you