Just go to the Channel feature from the Navigation column, click on the Channel you want, and follow. You get back to your followed Channel the same way, or you can add it as a column in the "Deck" layout.
@atomicpoet Hi Chris, this is really not important, but I exported my archive from masto.ai but can't import to calckey. It's a very small archive (3 MB) but I keep getting this message: