OK, the error messages were right! The mountpoints for your cdrom and floppy are incorrect.

You need to make new icons (really, they're links).

Right click on the Kde desktop. Create New > CD/DVDROM device. In the "device" tab put

/dev/cdrom

and everything should be fine. Similar for the floppy. Then (once you've got them working) you can right click on the old ones and select delete.

To mount, right click and select mount.