Having trouble removing double hung wood in vinyl sides

Bathroom window, it's not an older double hung with the pulley hung weights but a newer one that has inset aluminum counterbalance springs in the vinyl sides.
The lower pane is broken and needs to be pulled to put in new glass.

Here's what it looks like....





I don't see any fasteners holding in the vinyl slides. I can rattle the vinyl bit, and it feels like there's a fastener in there somewhere holding it to the side but I have no idea where it is...
I don't see any way to secure the counterbalance, or any cutouts to pull the window from the sides. What am I missing?

 

What are you wanting to do? Take the sash out? I think those look like Marvin's. They tilt in. Pound the left side jamb with your fist while you pull on the left side (top) of the sash until it jumps the track a little... repeat on the right... tip it down perpendicular then lift it out. You might need to twist the sash higher on one end than the other to get it out.

Putting them back in can be tricky, its the reverse process... but to reconnect them you have to install the sashes high enough so that they are above the pivots, and when you have them vertical again, drop the sash sharply the raise it and see if it's hooked, if not drop it again.

 

I thought that might be the only way for it to come out and it'll be more obvious once it's apart but didn't want to start smashing at it without some confidence I won't cause more damage.
Thanks!

 

Got it out and to the glass shop already. I was looking for a more defined way to remove it like there is on more modern Windows. Just took more force to push the vinyl side away and yank it free at the top than I had been comfortable with initially.
25$ to replace the 18x18 pane. Not horrible for this area I don't think.

 

Cripes, is it single pane?

 

It is. But I'm not paying for it. It's on them to cover that part. I took it down to the glass shop, came back, gave them the slip, told them it was $25 and that it could be picked up the next day.