In the top right of the webpage, there is a menu icon, from which you can change to Subscribed. If you want this to be the default view on the Kbin homepage, you can change it in the settings (hover above your profile name in top right > Profile > change to Subscriptions in Homepage)
I get that when I first type in kbin.social or click my browser bookmark, but having changed the settings, clicking in the kbin logo in the upper left takes me to my subs, and that behavior is persistent.
I think it's saved properly, since when I go back and look at Settings -> Appearance -> Homepage, it does say Subscriptions. But when I load https://kbin.social it always gives me the All view and I have to change it manually.
Though actually, now that I'm looking at it, when I choose Subscriptions, the url changes to https://kbin.social/sub so maybe I just need to make that my bookmark?