1.Connect the FTP and upload your logo in binary mode to templates/images folder.

Also you need to adjust the width and height in style.css

#header h1 a {
display: block;
width: SET LOGO WIDTH;
height: SET LOGO HEIGHT;
border: none;
}


2.You can edit and modify the channel by login into admin area

Channel Management = > View Channels => edit


3. Create new watemark logo and upload it to templates/images/watermark.gif

If you don't want to show the watermark logo in the video player

remove the following line from include/player.inc

so.addVariable("logo","{$config['baseurl']}/templates/images/watermark.gif");