Denzel Chia
Moderator
Post count: 3222
Been thanked: 128 times
#27987 |

Hi,

It’s in WordPress admin -> Appearance -> Editor.
Not within the theme. It’s a WordPress core feature.

http://img.prntscr.com/img?url=http://i.imgur.com/6W5BNx5.png

If you do it wrongly, your website will crash.
If it crash, you will need to ask your web hosting company to revert your customization.

Thank you.