How to add a new Extension?

How to add a new Extension?
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we created a new plugin to help game developers to get more downloads.
It’s a white label solution.
You can see a short movie about us -

you can try some of the games:

The new song pop (with your own music) -
Cards game (21) -
Horse racing -
Sport game (Penalty) -
Car Racing -
SnowBoard -

How can i upload it to the site?

when i click on “Add an Extension Featured” i get “you are not authorized to access this page”

Thanks for your help.