I downloaded the 64bit Windows installed for "Tor Browser" from this URL

https://www.torproject.org/download/download-easy.html.en

It installed and worked as expected and can display normal and .onion sites. The first default page it displays is about:tor Under "you can help" there is a link called Run a Tor Relay Node which says

Alas, since Vidalia (a graphical interface for Tor) is no longer included in Tor Browser, there are currently no easy relay packages for Windows and OS X users.

followed by Configure Tor by editing the torrc file.

I edited my ..\Tor Browser\Browser\TorBrowser\Data\Tor\torrc file as directed and added the port forward to my firewall. Unfortunately the Tor Browser failed to start after that and entered a failed to start, need to restart loop.

I enabled debug logging but nothing was added to the log during these events. I reverted the edits and verified the logging system actually worked. I trawled the tor site, Google and this site for further explicit information with no luck.

I am now assuming that the "Tor Browser" is 100% client and cannot relay traffic for any other users of the network.

Am I correct ? and if not, how do I active the relay functionality. Thanks.

Clarification

I understand and followed the instructions on the Tor site. What I don't know is if they failed because they were never intended to work on the Tor Browser or for some other reason.