The submit button is missing from Gather post or article comment

Issue Symptoms

Customers are unable to submit comments on articles or community posts because the "Submit" button is missing.

Conditions

• Help Center is activated
• The participant is logged in and has activated the comment box, but no submit button has appeared:
  

Resolution

1. Ensure that the comment box has been clicked in, as the submit button does not appear until this has happened.
2. Remove the display: none; declaration from the .comment-form-controls class selector in your CSS file (most likely the styles.css). 
   • In most cases, it's very likely that the submit button is not displaying is because the comment-form-controls class selector is currently set to display: none;.
     
     While this is normal in a default theme, this declaration should be removed by Javascript when someone visits your Help Center and clicks in the comment box. It's possible that customizations to the Help Center have disabled the default Javascript that allowed this feature to work as expected.

More information about ensuring that the submit button is displayed:

• To have the submit button be a permanent fixture in the comment section, you can simply remove the display attribute from your Help Center's CSS.
• Otherwise, the custom Javascript would need to be modified to allow this feature to work as expected. Resetting your content back to the original default CSS and Javascript would resolve this behavior.

You can read more about customizing the CSS or Javascript in your custom theme here.