ensure the switch on the handle is not set to the STOP position.
Push the choke leaver to the full choke position ( if its cold and not been recentlt started) otherwise half choke or no choke position.
Pull the throttle leaver in and press the small red button behind the throttle leaver which will keep the throttle in a little.
Pull briskly on the starter cord two or three times.
It should try to fire. If it does but does not start, reduce the choke or take it off altogether and pull the atarter again. .
You should be running now.
May need warming once started for a few seconds before it runs properly.
It should be noted that a regular problem is a build up of oil and old fuel in the carburetor especially after a winter of not being used. This will stop it starting. If you are not a DIY person, take it and get it serviced.
Stevec
May 2015