How to upgrade my theme to 2.8.4

Hallo ,

My theme does not work and broken after upgraded to 2.8.4

the homepage layout is miss and the theme does not work properly ..

Also i noticed that in old wp version the theme ADMIN PAGE was listed under the menu DESIGN which called now ( APPEARANCE ) and both refer to the file themes.php ..

With the new version of WP i do not see my theme OPTIONS page listed in the menu APPEARANCE ( theme.php ) .

Please explaine to me how to configure my theme to work with new WP version and to list it in APPEARANCE ..

Thanks in advance