How to use the Profiles2 module for Drupal
The URL is dynamic, per-user and per-profile... for my site, it's something like the following: user/[user-id]/edit/[profile2-machine-name].

This would be different depending on 


the user whose profile is being edited 
the profile2 profile that is being edited for that user


Alternatively, of course, you might want to just go to your 'my account' page (at /user), click on 'Edit,' and then in the local menu tasks (under the edit tab), you can click on the profile2 profile you'd like to edit.

With regard to a template to change the page, I'm not sure if there is one. You could do a hook_form_alter() in a custom module to change the form values a bit, but you might want to look around the profile2 documentation or module itself to see how these pages are built.