I am existing First Gold Plus user but couldn't find the option to opt in the postpaid app.

"For starters, Celcom is now offering free Super VideoWalla passes for 12-months to new FIRST Gold and FIRST Gold Plus subscribers. Existing customers for both plans as well as FIRST Gold Supreme, and FIRST Platinum are able to receive these passes for free as well by opting in through MyCelcom Postpaid App.

Under this offer, FIRST Gold customers will receive the 30GB pass while FIRST Gold Plus and above will be given the 100GB pass. According to Celcom, this offer is available for limited time although it didn’t specify the promo’s actual duration."