Many themes provide an easy way to show a custom logo or banner for your site. All you need to do is to upload the image file (you may use cpanel or ftp), note the URL, and tell the theme to use that URL. You may want to test your desired logo or banner out on a test version of your site, to see if it is compatable with your theme.
- Upload your logo/banner to someplace handy. Note where it is, and figure out its URL. If you are using cpanel, you can use cpanel to tell you the link to the file. Copy the URL.
- Login to your forum and go to Admin > Configuration > Current Theme
- In the text input labelled Logo image URL:, enter the URL you copied earlier.
- Select the Save button to save your change.