If you are looking to overwrite the default logo at the footer of Elgg social media script, you can do it in two different ways.

1. Edit the core files and use your custom path
First way to remove powered by Elgg is to edit the core php file and put the path of a new logo on it’s place. This will remove the old image location and put your new image instead of powered by elgg default logo url.

2. Overwrite the image file in the following directory: _graphics
Second way of removing the powered by elgg logo is to overwrite the image itself. Check out the path where the default logo of elgg is store and replace it with your own logo.

What are others searching to reach this post:
How to remove powered by Elgg
Remove powered by Elgg
How to remove powered by Elgg
Powered by Elgg