The issue of editing root nodes is considered a feature, and
not a bug. I don't totally agree with the policy, but I do
understand the reasons for it. Changing a top-level
node can cause havoc (or at least some extreme
out-of-context replies). Hence, the mighty "Preview" tag.
Some top-level nodes *can* be edited (e.g. snippets)
but in general, you just have to be
really careful. Extreme errors can be changed by making a
petition to the gods
. For minor ones,
replying to yourself is sometimes the best way to go.
Don't worry about making a post you later regretted
or really, really wanted to edit - we've all done the
same. Consider it a rite of passage. :)