Are you viewing on a mobile phone/tablet?
Try viewing it on a computer. When you hover over the green star, it will pop up a little window listing out some details / fine prints.
For example, the green star beside Advance Seat Reservation says:
1. Member’s spouse can also enjoy this benefit when travelling with the member.
2. Subject to availability at the time of reservation and applicable to paid tickets only. Please note that group fares and unaccompanied minors (children aged 12 years or below who travel alone) are not eligible for Advance Seat Reservation. Members must check in at least one hour before departure, or seats will be released.
Priority Waitlisting
1. Member’s spouse can also enjoy this benefit when travelling with the member.
2. Only applicable to paid tickets; not applicable to prize, donation or redemption tickets.