Can edit only my last post in each forum

In each forum I can edit only the last post.
How can I change it?

Example:

Edit

This is the intended behavior. This was updated perhaps a month ago due to an incident in which a user vandalized the content of hundreds of posts going back years. Now you can only edit a post if no one has replied to it yet. (That is, if it is the last post in a thread.) If you have a requirement to edit older posts, Regional Coordinators have moderator powers in regional forums, Project Admins have moderator powers in project forums, and Event Admins have moderator powers in event forums.

Many thanks Dan for the reply!
I need to regularly update a post on projects in a regional forum. Since this change I did this by editing the first post I made, which now is not possible. Can our RC give me such access to edit this post whenever I need or only occasionally?