I saw this question - Collision detection problem - earlier and wanted to edit it, but the edit link was missing:
I thought that perhaps it was because the question was too new. However, on coming back I see that the links are still missing and that another < 2K reputation user has edited the post.
Other recent question - How to create a "flying" game - for example, do have the links.
Why are the "edit" and "retag" links missing?