In the Layout section after creating the stream, you have the option of uploading a custom logo, changing the color of the player, activating Autoplay (stream starts automatically after opening without pressing play) and allowing/disallowing the sharing of the stream.
The .jpg, .jpeg and .png image formats are suitable for the logo. You can also place a link (e.g. to your website) on the logo. Enter the link under “Individual player link”. Your uploaded logo will then appear in the player as follows (this is an example logo):