Rather than directly touching the code to alter the logo, the easier thing to do is just replace the original image with your own (keep in mind it has to be .gif but there are online converters that will turn it into a gif for you)
Just go to this directory to change it: Templates -> Brain ->...
Don't add any tables, if you go into User and at the end of the entry for your user you should already see something like "adminpin" set a 4 digit number there and save it through Navicat.
I have been slacking big time - I have got a little bit of school before the 2 weeks break come so once it comes round I'll start pushing videos out again - a week or two maximum :)
I can't remember exactly how I done mine but give this a shot: Download the image and then put it into the "c_images" folder.
Once it is in there, go back to your retro (you may need to clear cache) and place the room advert and try one of these as the URL for it:
//c_images/imagename.png
OR...
Had I found the issue I would of posted it here but I never found the cause, I looked well but didn't see any apparent issue. I just done it from scratch using the files he was using and it worked fine.