I’m a third year engineering student interested in GSoC 2018, I have been using PyMC for my project on bitcoin prediction and written a paper on the same. I would like to give back to the community by doing the contributions to PyMC. I have started to look into the issues in GitHub. Can you guide me with the further steps?
You can have a look at the beginner friendly issues, and try to fire up some PR to get started 
Also, did you have a look at the GSoC project page?