I found in one of the conversation,which is used to hide the "Ask a Question" button in CSS branding editor of Customer community napili template.
.siteforceNapiliFooter #askCommunity { display: none; }
Similarly is there an option to hide "Follow,edit and delete" in record banner of case detail page ?
I have finally figured it out. The force:hasRecordId is not available with Salesforce Communities. To access the record Id from a data detail page, you need to do two things:
Create an aura attribute to hold the variable, and ensure you don't include a default value here
Create a design attribute with a default value of {!recordId}
And that will allow the system to pass the record ID to the component when it loads on the page.
The Options that we see in the Select Post Destination is based on the Navigational Topics .
You will need to add some Navigational Topics to see the Options there .
Take a look at screenshot from one my sample orgs
Here is good old blog from me on how to set these
Best Answer
You need to remove those from the Salesforce1 Actions on the Page Layout. That will get rid of them for ya.
Via CSS you can remove the follow by plugging this into the Custom CSS in the branding editor: