If you missed the lecture where I went through the proposal template you might be confused about the blank bibliography at the end that says “no sources”. This will get updated as you add references, so long as you use Word’s built-in citation tools.
I’ve written a tutorial on using these tools and posted it as a page which you can read here. Bear in mind that this assumes you’re starting from scratch and in the template I’ve already inserted the bibliography for you. All you need to do is add references and then update the bibliography. I’ll try to post a video soon but in the meantime, look at the example proposal in Dropbox.