I can't solve why you can't get a wireless signal, but for the AP working I would like to advise you use the Access Point Mode. I'm not clear what your hardware version is, so I give you the all the...

You can set up rate limit for all clients. See from http://www.tp-link.com/en/faq-914.html. I can't understand your question clearly, but the faq-915 maybe tell us more that administrator can...

Just c heck if you enable the guest network and choose Timeout in the Access Time. If you disable the guest network, I don't know either but you can contact the tplink technical support....

See how to configure the TL-WA850RE(eu) in http://www.tplink.com/en/faq-698.html or click into the web that vivian have talked.

Can you confirm your TD-W8901N is working well first? Which mean that you can surf the internet through the TD-W8901N. Then I will tell you how to extend an existing wireless network's which is...

It may be due to a lack of bandwidth. What is your bandwidth the ISP provide. Furthermore, except the problem of the online video games, are there any other problem?