How can I add an option in the beginning?

Answer 1

Use prependTo()

$('#myselect').prependTo($('my-option'));//typo? 

You might have meant this

$('#myselect').prepend($('my-option'));  

http://api.jquery.com/prependTo

http://api.jquery.com/prepend/

But your code is actually the other way around. This might be a typo. In any case, the methods available are prepend() and prependTo()