How do I add the Mephis 6.5 DVD to the synaptic package manager. If I do it by add cd it says cannot mount cd. I know there is a way to do it by- settings- repositories- new, but I do not know what to write on the 3 lines. I also think you can do it by editing /etc/apt/sources.list but I still don't know what to write. Sorry that it seems like a dumb question but I just can't figure it out.
I have the DVD mounted and I can see the contents from konqueror, but when I do edit add cdin package manager it will come up E: failed to mount cdrom. I have mepis 6.0 installed on another computer and that works fine . This problem is only with Mepis 6.5. I have both versions amd64 and i386 and it has the same problem on both computers.

I answered this question on the mepis forum already: http://www.mepis.org/node/13979