RSA Archer support Single Sign On for Active Directory accounts out of the box without any magic required as long as your Windows Server you are running IIS on is a part of the Active Directory domain. You just need to enable Single Sign On in Archer Control Panel and allow Windows Forms authentication. You may need to enable it as well in web.config file. RSA has a detailed guide on Archer Support community site about how this can be done.
At this point I have two versions how to interpret your question:
Version 1: I think that the question you want to ask is how to connect Windows Web Server to the existing Windows Active Directory domain.
If this is the case then you need to ask this question in the Windows Administration stack exchange community. RSA Archer product has nothing to do with making Windows server trust each other on Active Directory domains.
Version 2: You probably are trying to expose Archer to the external users, so the domain you are trying to establish "federation" with is not the same as your Windows Server domain. In this case your question would make sense.
And in this case I would ask your team to provide you detailed instructions about how to extract required information. Different federation services/products may require different information.
In my past experience I asked to have a call with a federation service administrator and followed his instructions and gathered the info he wanted.
Good luck!
