How to set default PyCharm interpreter?

Question

My PyCharm installation has two interpreters available:

• Python 3.3.2 (/usr/bin/python3.3m)
• Python 2.7.5 (/usr/bin/python2.7)

Whenever I

Answer 1

This has now changed in the newer versions of PyCharm (I've got 2018.2). It's now called Preferences for New Projects: