The Remote Corpus contains all the remote metadata. Currently it is not possible to add anything to remote corpora or edit it in general using Arbil. It is primarily used to view data and also allows you to import metadata into the Local corpus (discussed in Section 3.2) where they can then be modified.
It has a tree-like structure in which each node contains multiple sub-branches. To open any of them, click on the bullet to the left of the node representing the branch or double click the node itself. This can be repeated for the sub-branches as well. In this way you can view the whole structure of the corpus. If you click the bullet again, the node will fold back.