Simple just follow the tasks just like any other story that pops up on ur phone there's a thread called "stories tiers rewards" that give u the task and options to help u progress thru it u can refer to
Buying the pass just unlocks the quest line. Just follow the quests on the phone. You dont have to do anything extra to activate it. It auto activates the moment you buy it
Question answered, you can ask general game questions on this thread, or in the #advice channel on the pimd discord.