LMMS loops at bar-ends in piano-roll.
In songeditor you need to set the Loopmarkers https://docs.lmms.io/user-manual/naviga ... k-controls
If you are looking for a method that insert a loop in song-editor like in FLstudio, we do not have that. We believe that makes music to repetitive.
You can compose in Beat-editor, and that will create a loop, but it is not the best way to use LMMS.
Besides that, since you are new in Forum
Welcome sodaJar!
Here are all important links:
http://lmms.io/forum/viewtopic.php?f=1&t=4740
-A few rules and useful forum instructions
If you like to introduce yourself, to the community, go here:
http://lmms.io/forum/viewtopic.php?f=4&t=4480