I cannot supply the required info per the READ ME  just yet... I don't understand a couple of things. I may be able to complete the bridge if the wizard were simpler to use....
My forum:
http://www.washingtonforwildlife.org/forum
Coppermine is installed at:
http://www.washingtonforwildlife.org/Gallery
I don't comprehend the relative path  nor all of the ../  & ../forum/ etc. it confuses me
I set up a test account, not sure what good it will do you as admin is required to get to bridge manager.
			
			
			
				•   I have the following issue when trying to bridge coppermine and PHPBB3:
•   I Don't have an error because I can't get that far
•   Coppermine install: http://www.washingtonforwildlife.org/gallery
•   Wanting to bridge with http://www.washingtonforwildlife.org/forum
•   Bridging app install: ?? what does this mean
•   Coppermine version: cpg1.5.16
•   Bridging app version: PHPBB 3.0.9
•   Test user account: testacct / coppertest
•   BridgeManager settings: basically none yet, don't understand the terminology used
•   Bridge app URL:  ??????
•   Relative path to your bridge app's config file: ???????
•   Cookie name or prefix:  ?
•   Use bridge app custom groups?:  ?  
			
			
			
				Google will help you to understand basic terms like "relative path", "URL" and how a (unix) file system is structured.
Basically, the relative path to your board is
Quote../forum/
because from the view of your gallery you have to go one directory up (
../) and then open 
forum/ to find your board's root directory.
			
				What is  Bridge App URL looking for? In other words what is considered my bridge app?