To comment on an item within the Activity stream, select
Comment
and a comment box will appear. Type in your comment and click post to post it. Users can mention people by typing an
@
symbol and entering the user they wish to tag's name (this uses the autocomplete feature, so starting to type a user name will display all relevant users) and can also add a tag, by typing the
#
symbol and entering their tag. If any comments already exist, the
Comment
button is preceded by the number of comments.