You can add News Comment plugin from Add element wizard
Now, set all the settings of Comment plugin
Custom Date Format: Check this checkbox to use custom date format to display in Comment list.
Date Format: You can use any of the standard date format as well.
Time Format: You can use any of the standard time format as well.
Captcha Settings: You can set whether to display Captcha or not. You can select one of the options from below:
If you select Image Captcha, you should enable .htaccess file which is placed in Private folder of this extension.
Add User Image: Add user image to display for all commments.