help: Document "Browse and subscribe to streams" mobile feature.

help/browse-and-subscribe-to-streams.md

@@ -19,6 +19,21 @@
     **by number of subscribers** (<i class="fa fa-user-o"></i>), or
     **by estimated weekly traffic** (<i class="fa fa-bar-chart"></i>).
 
+{tab|mobile}
+
+{!mobile-all-streams-view.md!}
+
+1. Scroll through the list of streams.
+
+1. Tap the **plus**
+   (<img src="/static/images/help/mobile-plus-icon.svg" alt="plus" class="mobile-icon"/>)
+   icon to the right of a stream to subscribe to it.
+
+!!! tip ""
+
+    You can also press and hold a stream until the long-press menu appears, and
+    tap **Subscribe**.
+
 {end_tabs}
 
 ## Related articles

help/include/mobile-all-streams-view.md

@@ -0,0 +1,5 @@
+1. Tap the **Streams**
+   (<img src="/static/images/help/mobile-hash-icon.svg" alt="hash" class="mobile-icon"/>)
+   tab at the bottom of the app.
+
+1. Scroll down to the bottom, and tap **ALL STREAMS**.