I guess you mean the 'Music and Artist Information' LMS plugin. Once that's enabled, if you navigate to the track info (say 'Home'->'All albums'->'some album'->'a track') it will show in the left pane a load of info like track number, format, duration, file location etc. Towards the end you should see 'Lyrics' - click on it to see them. If it's a track in the current playlist then just click on the track title in the playlist to get to the track info page. I've not tried this in daphile but the skin modifications are relatively minor and don't usually stop things working, but it's not impossible that it has. In that case you can just use the normal LMS web interface that's available on port 9000 - say you'd usually access daphile via
http://my-daphile.local/ the normal LMS will be at
http://my-daphile.local:9000/ - you can also use this route to get to the Material Skin version of the interface if you enable that plugin for a more mobile-friendly web interface.