At least for me, when I post in a thread, I am automatically subscribed to that thread. I can subsequently unsubscribe, but the initial subscription is automatic when I post there.
You can change your options in User CP under Edit Options; Messaging & Notification .
This is how it is for me, too, but the only issue is that I don’t get automatically sent daily emails for any of those threads (like I’m supposed to via the CP) unless I manually subscribe to the thread on the actual website. I’m subscribed via Tapatalk, but it doesn’t add my default notification.
Have you tried using the Sultantheme skin (in a browser) instead of the regular Straight Dope skin? Much easier to read the site on a phone that way. As soon as that skin was available, I dropped Tapatalk like a hot potato.
I don’t love everything about that skin (it always formats links as their own line for one thing) but it makes this board usable on a mobile device. With the regular skin I have to pinch-and-zoom on every page to make text readable.
My understanding is that Sultantheme was designed for mobile platforms. Which is why management is always so confused when I try to talk to them about Tapatalk. "But we HAVE mobile functionality … "
Use what works best for you. I can’t hardly see anything on a phone screen to begin with and so reading the site from my phone does not work well at all. So I’m not much help from the phone side, sorry to say.