Ok, I found the answer when looking to add an interpreter. go to run > edit configuration.
I don't know if this is necessary, but I just set the working directory for the project interpreter to be the application one (it might do this by default).
Down below that, there is a place with a + icon above it. Click there to add an external tool.
The necessary settings for that tool is program: "quickly" and parameters: "run" (both without quotes).
Again, I'm not sure if it's nessecary to set the working directory here, but I did it just to be safe.