i can't find the edit button in the themes appearance

Hi Wessam,

Are you referring to the Theme File Editor? If so, the usual cause of this is a Security feature either from a Plugin or your server.

You can try adding define( 'DISALLOW_FILE_EDIT', false ); in your wp-config file.

You can ask your Hosting Provider for instructions on how to access your FTP.

You can also edit theme files through your FTP. FTP reference: https://wordpress.org/support/article/using-filezilla/