Hi Popitay,
When you clicked the open shop button to blue did you press save at the bottom of the page?
Just a few things I would try -
*click to unopen shop and then click it blue again to open and press save.
*log out of tictail and then log back in again
If that doesn't work you might find some help here -
https://help.tictail.com/hc/en-us/articles/207341519-Why-can-t-I-find-my-shop-on-Tictail-Tictail tend to reply in a 1-2 days in my experience.
Let us know when you get it sorted.