Hi, Welcome to the Forum Lil knowne!
Here are all important links:
http://lmms.io/forum/viewtopic.php?f=1&t=4740
-A few rules and useful forum instructions
Yes!can i post my songs on youtube spotify and sell my beats
Everything you m a k e with LMMS is your property. IF it is original and made 100% by YOU!
That is legally known as Derivative works
You are however not allowed to redistribute anything from LMMS' factory content