Just copy the contents of the wwwroot folder in the package into the root of your mojoPortal site and everything should land where it needs to go. (note: copy the contents not the folder itself)
then visit the /Setup/Default.aspx page and it will run the needed database scripts and configure the feature.
after that it will show up in the feature list and you add it to a page just like any other feature.
Note that it does require the latest version of mojoPortal (2.3.6.7), you can find your version under Administration > System Info
If your version is lower than that the best thing to do would be to upgrade mojoPortal before installing. If that is a problem then let me know your mojoPortal version and if needed I can send you an older version of Event Calendar Pro.
Hope that helps,
Joe