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@DotᚖMac As far as subscribing to threads, there currently isn't any way to receive a notification about threads via the App, but you can subscribe to threads and receive email notifications by clicking the topic options button in the top right-hand corner of the thread you want to subscribe to and then click the subscribe button on the pull-down menu.
From your email, you can open threads using the notifications and then access them on your mobile browser.
You can also edit your notification settings by clicking the gear icon in the top right-hand corner of the Community > click Settings from the pulldown > Click the Subscriptions & Notifications tab > and then edit your notification settings to your preference.
Hope this helps you out!