AirborneZed

Yes, but that's when you select it. I was talking about descending in Vnav.
 
Let's say you're on FLCH, but the plane is descending too quickly, you'll be a low on profile, below glide slope far away, etc.
 
So you increase power while on ARM, which makes airspeed increase, making the autopilot pitch up the plane resulting in lower Descent rate.
 
...Or you can just select vertical speed. lul.

That is an altitude restriction. If there is a specific lower speed for that waypoint, it will show a circle.
 
Remember that on the 777, the FMS does not change the speed on final approach per waypoint based on VREF as the NGX does. (Page 137 intro manual. Flight management computer section)
 
For approach, you have to decide when to slow down.
 
In the second screenshot, there is a specific speed set in the FMS to slow down to for the next waypoints.

You probably haven't selected the radio and mic in your radio panel.( the white button and mic button)
 
 

Yes