Where to add php-code? – Redirection 301 from blogger to wordpress

Hi, I just finished my new website with enfold and put it to my www. It really looks very nice an professionally. :D

The last thing to do is to redirect my visitors from blogger blogposts to my wordpress site. I decided to follow this tutorial: http://www.wpbeginner.com/wp-tutorials/how-to-switch-from-blogger-to-wordpress-without-losing-google-rankings/

Step A is fine-all is coming to my new page, but at the moment only at the frontpage. The instructions tell me, I have finally I have to set a php-code to the funcions.php of the theme, so that people are redirected to the blogpost they wanted to see originally.

But I dont know where to add at enfold theme – funtions.php or functions-enfold.php??? And where? at the beginning or at the end? I already tried (after making a copy of the file), but it didn´t work and I don´t want to make any mistakes.

Maybe you could help me-or is there a more elegant way to do this?
At the moment the redirection from blogger takes a while and a strange code is shown for a while…-not so nice. nicibiene.blogspot.de

Thanks in advance
Nicole