If a user has less than 50 reputation, it is known that they cannot comment on posts other than their own.
I've been in a situtaion, (this applies to the wider stack exchange interface) where I have ...
I have encountered a bug in the site Super User.
I make two comments :
Here is the Tadpole.
There is the Caterpillar.
To edit the comment 1, I click edit. In editing my comment, I add my new text :