With this theme, that might be a bit complicated due to how this one is structured and coded. However, if you go to Google and type in this keyword set “static footer at bottom of screen”, you will find many tutorials on how this is done (generally speaking). I cannot guarantee how it will work for Morphology, but for the footer container that you would be focusing on keeping fixed in place, is this:
For the side column footer container, it has a class=”column-footer” and then for the main content area, the footer sits in this container with the ID of id=”footer-wrapper”
Overall, this is going to be a tricky one, although I do not know what your coding experience is, check out the Google results of tutorials.