If I copy a selection like this:
,there will be like nothing when I paste.
There are no blue colored notes which I could move. But if I moved a single note from that selection (after I pasted the clipboard) there is another note below.
'the triangle' is also known as the playhead :)
I really think reading at least the first part of the wiki, https://lmms.io/documentation/Getting_Started
could help you @vecciora, and let you get more fun from using lmms :)