What Colin Said, or RTFM
http://www.jhaudio.com/files/User-Guide-Promusic.pdf
P7-P9 "Inserting the earpieces"
Roll the earpiece forward by about a quarter turn, and carefully slide the sound bore into your ear canal.
Gently roll the earpiece backwards to create a comfortable seal with your ear. Push the top of the earpiece under the helix lock to secure it into place. Do you know what a “helix lock” is? Yeah, us neither. Push the top of the earpiece under the upper rim of your ear instead. Your JH Pro IEM is marked with blue lettering to indicate the left earpiece and red lettering to indicate the right earpiece