Downloadable Skins are introduce in version 2.0. So to use this you must install E Player Plus version 2.0+.
Download E Player Plus : https://play.google.com/store/apps/details?id=com.garvit.app.mp3cscp.plus
1. Download the skin.
2. Open E Player Plus and go to Settings->Look and feel->Skins.
3. Select your downloaded skin.
4. If downloaded skin does not shown in skin list, then click on "Scan for skins" and check again
Settings->Look and feel->Download skins . Click this to anytime to download more skins.
More Skins will add soon.