How to delete Datebase in TargetManager?

Well..... It is right to write this section

(if wrong please give information what section is right)

I was used...

Develop -> TargetManager -> Add Database.

but some database not fit or write as missed by accident.

so I want delete 'Database' or change Database name.

In My opinion I want delete Database. what way proper?

in addition how can change Database name in my account.

Thank you for reading my written.