clarkwinkelmann Thanks very much for your reply. And sorry for my late reply.
This issue resloved after I made some changes on CSS. Now my website is showing the green dots. Previously, it showing the white dots, and it's invisible unless the cursor is hover on it.
It never came to me that someone will not be able to find post edit button. But one of my website user asked me, where is the post editing button.
You will need to click the dots then it will show up. Would it be user friendly to leave it right next to reply button? Just my thought. Or even have an option to showing it up without having to click any button.