Here's a short video that shows at 25 seconds the side view with the ASA set to 100. The index line has been rotated with repect to the ASA scale. However, it doesn't show how the setting was made.
If pulling up or pressing doesn't work, how about turning the knob all the way to one end and then trying to continue turning? (Don't force it too hard.) Maybe with the knob adjusted to one end, continuing to turn will make the outer ring click further?
https://www.youtube.com/watch?v=Azbfv8uYRkc