How to comment back on here?

I must repeat my previous entry for those who may have been in someway offended by my blue on black choice of text.....I said...I am not sure on the proper way to comment back on here, do I comment back on their page or right on my own page....you know like when Ericka says something funny( as she usually does) do I say "that is funny" on her page or on the same page as she said the funny thing on???? What is the blogger etiquette? I really don't wanna mess this up so...help? Ericka is a genius!!