Here's how to use the Nokia Composer to enter a tone.

Notes

Enter notes a - g by pressing keys 1 - 7 i.e.
1 = c
2 = d
3 = e
4 = f
5 = g
6 = a
7 = b

Duration

Decrease by pressing 8
Increase by pressing 9
Duration steps from 1 to 32 (32 shortest, 1 longest - 1 second)
 

Octaves

Press * to cycle through all three octaves
 

Pause

Add a pause by pressing 0. You can increase or decrease the pause using keys 8 and 9 as usual.

Sharp (Slighter higher tone)

To use a sharp press the hash (#) key. A # symbol appears next to the note.

Dotted Note

To create a dotted note (a note with a short pause) press the note-key (1-7) and hold for a second. A . will appear next to the note.