Yes, in FirstAgenda Live you have the option to add another person who wants to give the current speaker a comment.
If you want to add the meeting attendee on their behalf, you first need to click on the current speaker from the speaker list.
From here, you will have three options presented. By clicking the arrow icon in the middle you add the person to the list of participants who wants to comment.
When you click this button you will get a pop-up from where you can search for the participant you wish to add to the list of people who will comment on the current speaker.
Please click Add and the attendee will be added directly to the speaker list with a comment to another speaker.