At first, switch player type to Sticky Player. You can change various options for the audio such as sources, options, alignment and player skin. Lets talk one by one
By this settings you can upload/change audio file and audio poster, also you can set the audio title.
Enable/disable repeat, set Initial volume and show/hide Download Button by the options.
From here you can change the alignment of the player.
In playlist player type, there are 2 different player skin: Simple and Fusion
In simple skin, you can change the background.