You don'tt have enough reputation points to edit. From the Q/A FAQ:
How does editing content work?
The ability to edit posts is dependent on your levels for specific reputation types. The following describes one or more levels and a set of associated reputation types. You have edit permission if you are the author or if you match all the levels with any one of the associated reputation types. We're still fine-tuning these rules so they may be tweaked.
silver Author
silver Authority
silver Editor
silver Organiser
The "silver" relates to how many points are requiresd to achieve thae necessary level, and the categories require different amounts of points for each "color" level. These points levels can be found in the
Reputation Points FAQ[
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