The note C is written in the third space of the staff. Notes written above the middle line of a staff usually have their stems going down.
The fingering for this C note is the same as that of middle C. Like the note G, you will once again need to use more pressure to sound this new C note correctly. Practice alternating between this C note and G, and also middle C as shown in the following example.
A dot written after a quarter note means that you hold the note for one and a half beats. A dotted quarter note is often followed by an eighth note.
This melody makes use of dotted quarter notes and also contains the new C note you have just learned.