Installing a package (using VirtualBox on Windows)

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I am trying to load a package (libbraiding) to use its functions in my .ipynb file. I accessed the terminal on VirtualBox using Host+F1 and typed sage for both the username and password. Then I entered the command "sage -i libbraiding". The terminal did some stuff for about a minute and then showed "Sage build/upgrade complete!". However, I still cannot use the functions in the package as the notebook says "NameError: global name 'left_normal_form' is not defined". What am I doing wrong? Any help will be much appreciated.