The messaging page allows you to view and edit your posts within specific campaigns. This can be found by going into campaign planner and selecting a campaign. Here, posts will be displayed with the details of your post in a table format.
To edit a post, click on the post on the table and this will direct you to post manager. If you would like to copy a post, you can do this by checking the box next to the post then click the clone icon (this will populate when the post has been selected and it will be displayed next to the bin icon) creating a clone copy, ready to be used.