Thread:User talk:Siebrand/Openstreetmap - I want to translate or make changes/corrections to Greek translations

When trying to correct the translation from "Κατεύθηνση: " to the correct "Κατεύθυνση: "

...it gives me an error "You do not have permission to edit this page, for the following reason: You do not have permission to edit pages in the Osm namespace."

Regards,