I have install 2 editor: YUI and TinyMCE
But wysiwyg settings are:
Why I can't setup editor on this input formats?
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In Drupal 6 you need to go to admin/settings/wysiwyg to edit these.
This image in front is a clean installation of Drupal 6 , viewing it as admin (user 1), and only having the WYSIWYG module and TimyMCE & YUI libraries installed.
You also need to have the user permission of 'administer filters'. If your screen doesn't look like the example then maybe another module is causing a permission issue (another permission might be needed to be added) or something is corrupt.