In the magazine tab on Kbin, it functions similarly to Lemmy. You can search for a community/magazine there, local or federated. If something doesn't show up because it's not federated yet, you can use the @ tag with the @ domain name. You can also use it as a list of all communities currently federating with your kbin instance by not typing anything into the search bar, selecting "local and federated" in the dropdown, and clicking search.