I tried several instruction.
For example, this one says
Well guess what. There is no option at lastpass to browse and pick csv.
I opened csv in text file and paste that to the text boxes. It doesn't work either.
Looks like the method is outdated.
I tried importing CSV and out of 73 items only 7 got imported.
I used notepad. I think I need someone from lastpass to actually tried. I used latest version of all apps.