It won’t let me print
You didn’t tell us which version of LO you are using or which operating system you use (there are several). And it would help us a great deal if you told us exactly what you do (key strokes, mouse action, which icon) when you command a print. A little more information will go a long way to answering your question.
Did you figure out what went wrong? Were you trying to use keyboard short-cuts learned from some other program? In LibreOffice Print is Ctrl+P. Using the drop-down menu Print is menu File → Print,