לעברית לחצו כאן
Download NetFree Security certificate from http://netfree.link/netfree-ca.crt.
Open the settings window: File > Settings > Tools > Server Certificates
Click on the green plus and add the Provider's certificate from the downloaded file.
(Sometimes even after installing a certificate according to the instructions here, there are still problems connecting, due to additional security certificates installed on the app. In this case, all certificates except the NetFree certificate must be deleted by clicking on the -).
Although the image is IntelliJ, the instructions are the same as PyCharm and WebStrorm.