Dear Wanda Loo aka jojo22,

Re: how to bite your tongue.
Firstly, locate the tongue. Its that long pink organ that you use
to lick things with.
Then you need to satisfy yourself that you know where your teeth are
and how to use them. aka 'gnashers'
When you think you have identified a control question, open your gnashers and bite down very firmly on the side of your pink, licking organ.
Yes it will hurt.
Practise often.