Hi, Welcome to the Forum jade182852 !
Here are all important links:
http://lmms.io/forum/viewtopic.php?f=1&t=4740
-A few rules and useful forum instructions
In song-editor set the loop-markershow do I leave a few seconds of silence in my music after the fade out or after finishing the song
As in this picture
Then in the export-settings choose Export-between-loopmarkers
Lmms will render everything marked as the loop, including silence