This applies to workspaces that have the newer Wall, which is being switched on in stages. If you do not see these options yet, your workspace has not received it.
What is new
Faster loading. Posts load a page at a time, pictures load as you scroll to them, and long posts are folded with Show more.
Pinning. Pin up to three posts to the top of the Wall. You need the Pin wall posts permission. Pinned posts appear first on the first page, newest pin first.
Editing. You can edit your own posts. An edited post is marked "edited". Only the author can edit.
More reactions. Each emoji is its own reaction, and you can react with up to six different emoji on one post. Before, different emoji could be mixed up with each other; that is fixed.
Pin a post
Open the post's menu and choose Pin. If three posts are already pinned you will be told to unpin one first. Choose Unpin to remove it.
Edit a post
Open your post's menu and choose Edit. Save. The post then shows "edited". While editing you can also choose to take the picture off the post.
React with more than one emoji
Pick an emoji from the reaction picker. You can add others, up to six. Choose an emoji again to remove it.
Home gets lighter too
The Wall box on Home now loads only the two latest posts instead of every post.
Related articles
The Wall: posting, reacting and removing posts