Apple PowerBook (2400c) - Manual (Page 67)

Installing application programs
You’ll probably want to buy and install additional application programs. Refer
to the manuals you receive with your programs for instructions on installing
and using them.
In most cases, you install application programs onto your internal hard disk
from floppy disks or a CD that you receive as part of an application program
package. The following illustration shows how to open the floppy disk drive
and insert a floppy disk into it.
Insert the disk metal
end first, label side up.
Open the top of the disk drive
and flip it under the drive to
serve as a stand.
67 Installing and Using Application Programs