Location: "Actions" menu
The "Add a remark" effect enables you to comment within other users’ comments.
To apply this effect you should open the "Actions" menu located under the comment you want to say something about.
Then make sure to click on the "Add a remark" icon in the user toolbar.
After the box with the comment appears, highlight the text you want to put a remark on, in the popup window write the remark and press the "Add remark" button. Then select the duration of the effect (the effect can be applied for as long as you choose) and press the "Apply for X points" button to apply the effect.
Note: This is a "paid" effect, which means that you’ll have to spend a certain amount of your points to add a remark to the comment.