Where to place controls in user account form?

I'm creating an user account window for my instant messenger application. enter image description here

User have to:

  • enter name, password, server
  • press button "Connect".

Also user can:

  • close this form without connection
  • enter advanced options (f.e. port, encoding).

And this form will show:

  • connection result, errors
  • warnings, tips for user (f.e. if some field will be clear)

I can not imagine how to show all this here. For example: make "Cancel" button or "Back" arrow in top left corner. Or maybe make "X" button in top right?

Could you help me? Thanks in advance!

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