Board Thread:Support Requests - Getting Technical/@comment-20013000-20140908085042/@comment-5558012-20140908142941

First, be sure you are trying to add it correctly. Go to Special:ThemeDesigner. You are by default on the "Customize" tab to the left, click the "Wordmark" tab right below it. You can find "Graphic Wordmark" in the middle of the page, choose a file, and upload. The file must be a .png than is no larger than 250 x 65 pixels.