Yes, members can edit thier own posts on VGR, but only within 10 minutes of posting them. This has been a long standing policy and it is there for security and to maintain post consistency. Being able to infinitely edit posts does open up the chance for people to abuse the system to retroactively add bad links and spam as well as "alter" arguments they have made when debating with others and unfairly affect the integrity of others posts. The 10 minute limit has been discussed before and we're certainly open to the idea of extending it if a compelling argument can be made.
Even if you're already past that 10 minute window, if you report your post to the mod team and explain why you want you post edited, we would consider that request so long as there is a good reason.