Most of what you'll be updating in the includes/config.inc.php are:
Code
  'DATABASE_SERVER' => 'localhost',
  'DATABASE_USER' => 'example',
  'DATABASE_PASSWORD' => 'dbpassword',
  'DATABASE_NAME' => 'example_forum',
  'TABLE_PREFIX' => 'ubbt_',
  'FULL_URL' => 'https://example.com/forum',
  'BASE_URL' => 'https://example.com/forum',
  'FULL_PATH' => '/home/example.com/public_html/forum',
  'SESSION_PATH' => '/home/example.com/public_html/forum/sessions',
  'REFERERS' => 'http://example.com/|https://example.com/',
  'HOMEPAGE_URL' => 'https://example.com/',
  'ATTACHMENTS_PATH' => '/home/example.com/public_html/forum/uploads/files/',
  'ATTACHMENTS_URL' => 'https://example.com/forum/uploads/files/',
  'SQL_LOG_PATH' => '/home/example.com/ubb_logging/',
  'CONVERT_PATH' => '/usr/bin/convert',
  'MOGRIFY_PATH' => '/usr/bin/mogrify',
  'CONTACT_URL' => 'https://example.com/contact/index.html',
  'UPLOADED_AVATAR_PATH' => '/home/example.com/public_html/forum/uploads/avatars',
  'UPLOADED_AVATAR_URL' => 'https://example.com/forum/uploads/avatars',

Please note that by changing your domain name any search engine rankings your site receives will now attribute to the new domain name instead, and it'll be quite a while before these changes roll out. A sitemap is helpful for getting new entries fed to search engines which allow them.

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