you can feedback to tplink support, send an email

did you find the 2.4G mac address of the extender under wireless statistics on the router? the mac address that you enter on the router probably is not the correct one.

you may reset the repeater if something is wrong with the product. if you mean the cloud registering thing, what could possibly go wrong? Did not receive activation email? Forgot cloud password? You...

the only way is to hard reset the router if you forgot the login password for most cases. now some of tplink routers have a password recovery function, http://www.tp-link.com/en/faq-1550.html

No WDS bridge on TL-WR941HP. if you want to extend wifi signal, set range extender mode

It looks like you want the WISP or hotspot mode, available on TL-WR902AC