PyCharm 4.0.0 Web Help
Open the Settings dialog
(e.g. Ctrl+Alt+SCtrl+Alt+SCtrl+Alt+SCtrl+Alt+SCtrl+Alt+SAlt+F7Ctrl+Alt+SCtrl+Alt+S⌘ Comma⌘ Comma⌘ Comma).
In the left-hand pane, select Plugins.
On the Plugins page that opens in the right-hand part of the dialog,
do one of the following:
To enable a plugin, select the check box to the right of its name.
To disable a plugin, clear the corresponding check box.
If the plugin of interest is not present in the list
(which may be the case for a repository plugin),
download and install the plugin.
Restart PyCharm for the changes to take effect.