Installing plugin

At first you can close all your opened projects. It is not necessary but it is a good practice before messing with plugins.

Figure 1. Closing projects.

Next from main screen go to plugins configuration page (main screen of IntelliJ -> Configure -> Plugins).

Figure 2. Main screen of IntelliJ.

Then in the bottom of the window click button Install plugin from disk....

Figure 3. Plugins screen.

Now select downloaded zip file with plugin and confirm your choice.

Figure 4. Selecting zip file.

Restart IntelliJ IDE to make changes applied. After that your editor with plugin will be ready to use.

Figure 5. Restarting IDE.