Commenting via the feed preview:
Scroll through the feed to find the post you want to comment on. At the bottom of the post, you can read existing comments or add your own.
Simply type your comment, and if needed, attach a file or photo, then click 'Post' to share it.
Full View — Open the post and leave a comment:
Click on the post to open it in full view. This allows you to read the entire post (especially if it's too long for the preview), see all comments, and add your own comment.
Simply type your comment and share your thoughts directly from the full view.