Default [Q]How to install Themer skin file

Hi, I'm a new android user. Just found out about Themer. Saw a skin that I like from one of the designer. He emailed me the skin file.
How do I install the skin file onto Themer? I have the file on my computer already. Can you guide me the steps to get the skin on my themer please. I'm using htc one m8, latest version. and the skin name is ORMINT. thank you