Create functions.php file in WordPress 2012 Child Theme

Hi

It is noted that there is no functions. php file in the Child Theme of my WordPress Default Theme 2012

I face challenges in creating functions.php.file in my Child Theme inspite of instructions given on how to create such file.

Can help to resolve this problem by accessing my website and create the functions.php.file in my Child Theme of WordPress 2012 please?

Staff access is active until 28 Apr 2015.

Thanks in advance for your help and support which will be most appreciated.

Have a nice week-end.

Benjamin