Make Userform That Will Update List In Spreadsheet?

I am trying to make a userform that will update a list in the spreadsheet. Basically if a user types into a multiline textbox numbers (separated by line) like so:

5
10
15
20

then the macro will paste that data at the end of a list so that each number is in a new cell. The only thing I have that comes close is Range("A1").value = listbox1.value The problem with this is that it will input the entire list into one cell. I have attemped various things, like trying to get the list into the clipboard and pasting, but I haven't really had much luck.