how to thread SinHow can I thread my Singsger sewing machine Concerto 2 /?

How can I thread my Singer SEwing machine Concerto 2? Do I have to thread the needle first? I do not have an instruction book to go by. The bobbin appears to be wound when it is in the bobbin case . I have put the thread into the bobbin slot but do not know how to proceed .
I would be glad of any help.
Thank you