URL for blog post (template)

Hi Support

I have my first EB 5 post here.

http://finalbug.net/blog/entry/421-template-for-videos

I started out with a template but kind of ended up building something myself from scratch.
Somehow the URL seems a little strange.
Is it possible to edit it after the event so that it looks more like this?

http://finalbug.net/blog/entry/421-tracks-roles-in-nles-part-1-of-3

there is going to be a part 2 & 3 and I think it would be important to have similar URLs as here for eg:

http://finalbug.net/blog/entry/404-in-depth-3d-titles-fcpx-10-2-part-1-of-3
http://finalbug.net/blog/entry/405-in-depth-3d-titles-fcpx-10-2-part-2-of-3
http://finalbug.net/blog/entry/406-in-depth-3d-titles-fcpx-10-2-part-3-of-3

thanks

Paul