It seems to connect ok with the HomeHub, but there is never any internet flowing...
Also, after setting the Range Extender and rebooting the TL-WR802N, I can no longer access the admin panel so I have use a paperclip to hard reset in order to get access again.
Welcome to the forums.
That is an interesting looking device. A little more context might help folks to make sensible suggestions:
What is the actual problem you are trying try to solve?
What mode are you configuring the TL-WR802N in?
Has it worked in this configuration an earlier router?