I was facing the same issue. I was using virtual environment and Django was installed in that.

I clicked on the area right to the Python (where verison of Python is written).

Clicking on it opens a drop down down, and asks "Select Interpreter".

Click on "Enter interpreter path..." .

In the input section asking "Enter path to a Python interpreter", enter path to your enterpreter.

I was using Linux I wrote: "/home/yuvraj/Virtual_environments/DjangoVenv/bin/".
Hope this helps.