How to install EA on Oanda demo MT4 platform?

Hi all, i am currently going through the lesson on EA, and I have downloaded the demo MT4 platform from Oanda to help me go through the lesson. I am not sure if it is because it is a demo account, but on my Oanda platform, there are no navigator pane nor any options about EA or backtester. I see on the Oanda website that they stated they do support EAs, but there are no instruction regarding how one actually install the EA.

Can someone with more experience with the Oanda platform points me to the right direction please? Thanks!