Minimum length of stay

I went through the help section to try and set a min length of stay, but I cannot continue past step 2, which is "Next to the date selector, you’ll see a small square with ‘Restrictions’ next to it. This square is a filter. Click on it to display all your restrictions for your rooms." This "square" is just not there.

I can see Set period, Occupancy prices, and Promotions....nothing else

Please update this help section, or assist me to set this.

Thanks