How do I update my article?

[knotical]

I'd like to update my article that lists scuba agency websites at:
SCUBA Agencies - Articles
I was able to update it a while back, but that capability seems to have gone away.
(Or am I missing something obvious?)

thanks

 

[knotical]

p.s. in case it's relevant: When I try to access knotical's blog it tells me:

You are not authorized to access this page.