It'll have a knob (ooh er missus..) which adjusts the tension and speed the spool revolves.
You need to adjust this for the weight of lure you're casting.
The text book way to set it is slacken off and adjust it so when you're holding the rod parallel to the ground, you can flick it into freespool and the lure will drop, but the spool will stop when it hits the ground.
After a while you start getting cocky and slackening off a bit more until an over-run catches you out.
Where are you from Glider, there may be someone near who can guest you out somewhere for a couple of hours and show you how to set it up.