Edit
noun, する verb, の adjective
Knit and gather everything back together, which you knit. When you do this to fix things and bring it back together, this is an edit.
へんしゅう
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.
どうしてブログ記事を編集するのに一時間もかかったんですか。
Why did it take you an hour to edit a blog article?