I sent my opinion to the letters section of the newspaper.
この書類の該当欄に記入してください。
Please fill in the relevant column on this form.
Refers to an input field or blank space in a form, web page, or application.
名前欄にフルネームを入力してください。
Please enter your full name in the name field.
Original meaning; now somewhat literary or seen in compound words like 欄干 (らんかん). In modern speech, 手すり is more common.
古い橋の欄にもたれて川を眺めた。
I leaned on the railing of the old bridge and gazed at the river.
Please fill in your current address in the address field.
That article was published in the business section.
Fill in the name field before submitting.
They added a free-comment field to the survey.
reader's column; letters-to-the-editor column