Hi, Welcome to the Forum Sam !
Here are all important links:
viewtopic.php?f=1&t=4740
-A few rules and useful forum instructions
What i think you have trouble with is the placement of one ore several finishing notes, that stretches into the adjacent bar to the right(?), i'm manking a beat, but in the piano roll i can't complete, because of if i complete, the melody is more long
The reason for that problem is the time-signature
You should be able to find a time-signature, that fits the number of notes in one bar
Read: https://lmms.io/wiki/index.php?title=To ... e_Controls
Here is a video that also explain this
https://youtu.be/24iarkQyQ_8