Talk to Lin Lin!
Errr... i've tried to talk to lin lin and whenever i talk to her the onky options i have is nevermind. I'v tried to try combining the ink and the pass before meeting her but i still got the same option
Edit: okay i figure it out now. Turns out you need to finish the mission where i need to save cassy firsy with the help of lin lin. Then i need to get massage by her and she will ask for tip for her help and then she will bring us to someplace and show us how to get more legit pass. Thank you so much for the info