How do I say 'first entry' (like in diary) in Japanese?
I'd like to enumerate my italki entries and I don't really know how to do it in Japanese. :)

Question

Answer

My first impression of the phrase "first entry" was "初めての投稿" (はじめての　とうこう).
２回目の投稿 (にかいめの　とうこう, my second entry)
３回目の投稿 (さんかいめの　とうこう, my third entry)

Of course fairytale-san's answer "初めての書き込み” is also a good expression :)

Answer

初めての(first)書込み(entry)