I have modified the header.php file myself, so please just unhide the top bar in order to see it.
Hi there,
Here is a tutorial on how to create a Child Theme :
1) Login to FTP using an FTP client like Filezilla ;
2) Access your WP installation/wp-content/themes/revoke2
;
3) Find and copy on local storage the style.css file from the theme folder;
4) Step back to themes folder and create a folder named revoke2-child (parent and child themes must be located in the same folder)
5) Open/Edit the style.css file from your local storage you just copied and add/edit the following lines :
Theme Name: Revoke2 Child
Template: revoke2
These are required lines for child-theme declaration;
6) Move the style.css you’ve just edited to revoke2-child folder;
7) Go to Dashboard -> Appearance -> Themes -> (activate) Revoke2 Child
8) Copy the customized header.php file to the child theme.
By making changes in child theme you will overwrite the files from parent themes and you won’t have trouble (losing your customization) after theme updates
P.S. By the way, here is the most detailed explanation offered by WordPress http://codex.wordpress.org/Child_Themes
Hope this will really help you protect your changes!
Best Regards,
Mihai