From the webpage:
To celebrate our new partnership, eligible HSBC Premier and Platinum credit card holders can enjoy 15% bonus Velocity Points when converting HSBC Rewards Points to Velocity Points*. Simply transfer Points between 1 September and 15 October 2015.
Transfer your HSBC Rewards Points to your Velocity account in two convenient ways:
Simply log-in to HSBC Internet Banking.
Or call 13 21 52.
thanks for posting OP, but FYI
one of the worst cards to earn velocity points, 2:1 with either a $1/1 or $1/1.25 reward scheme
so either 0.5/1 or 0.625/1 rate, so 0.575 or 0.71875 rate with this bonus.