After logging to QAWeb server, go to 'facility information' in Facility overview section as seen below.
You will find relay code and GUID under 'Relay information'. 
Useful tip: Copy relay code and GUID in a plain text application such as Notepad first, before copying them into designated fields, during the installation of a relay. Windows can copy some hidden characters from your browser input field if you copy relay code and GUID directly from the QAWeb server web page when installing/re-installing the relay, so further on during the installation, you can encounter an installation error.
