Editing headers on phpbb

I am trying to edit a header on a forum i have made, so i can use my own image:

I found this article which is fine as i know the location of the image:

However i have a q:

What do i edit it in? If i edit it in notepad, i worried i might screw up the code and the forum doesnt work.

The code is this:

So presumably i just edit the index.php file??

notepad is fine.

So if i back up database first then and apply and upload my php code i should be ok?

I dont think it is going to affect the database, but you can backup anyway just to be on the safe side.

If i edit it in notepad, i worried i might screw up the code and the forum doesnt work.

Then save the originals, and restore if something goes wrong and you cannot fix it.

on phpbb its the overallheader for the image. It should have the navagation in there also so you can add more links if you like