Scroll down to see how to do this in Symphony 1.5
In Symphony 2.0:
Go to your profile by clicking your avatar in the bottom left of your platform. Write your post in the text box at the top of your profile and click the arrow to post (figure 1).
Figure 1 Compose a wall post
Anyone inside your firm who views your profile can see your wall; external users cannot see your posts. You can delete, like, or share your posts, as well as posts from your colleagues using the buttons below the posts.
In Symphony 1.5:
Click + and Wall Post. After you’ve written a message, click Post (Figure 1):
Figure 1 Compose a wall post
Anyone who follows you or views your profile can see your wall. Click on your name in the top left to access your wall on the first tab of your profile. You can delete, like, share, or bookmark your posts, as well as posts from your colleagues.
Figure 2 Actions for wall posts