I'm currently 글쓰기 an 기사 where I need to insert 이미지 into the article. I don't know how most of 당신 do it, but I want to know it myself. Can 당신 help me?

It tells 당신 on the right of editing an 기사 how to do it.

Go to the bottom of the page where it says bottom image, then 업로드 your image. If it's the first image 당신 upload, it'll be 'img1'. If 당신 업로드 a 2nd image, it becomes 'img2' etc.

Type in (img1 center, large) but use the square brackets like ] [ in the 우주 where 당신 are typing out your article, like the example in the pic:

Then press 미리 보기 to see if you've done it right.