JVC DR-MX1S DVD Recorder/VCR "delete material" Questions

Can't delete recorded programmes from a DVD-RW disc. Also, the wording on the t.v. screen is not the same as shown in the Owners Manual when I use the remote controller. U can't deleting the recording

delete the programmes and also we can no longer record anything onto the hard drive or dub across to DVD. The programme that we were dubbing cannot be deleted or played. We have tried switching off at