Depending on how your webpage is designed, you may encounter something like this with your widget after you have installed/implemented it:  

The image shows that the widget is cut off when it is positioned on the right side of the page. You can resolve this using CSS:

.inmplayer-position-right .inmplayer-trigger {
  right: -52px;
}

You can change the property depending on what location you used for the widget. Add the above CSS to the CSS tab. Go to Sites -> choose the desired site -> Go to the Settings tab -> Go to the Player Appearance tab -> Go to the CSS tab and paste the code.