Have you checked your settings with PokerStars, played some hands and imported them into PokerTracker 4? If your name isn't there then you haven't imported any of those hands into your database yet. We have a guide for PokerStars here:
PokerStars Configuration GuidePokerTracker 4 only supports English so hand histories need to be saved in English (PokerStars Client -> Settings -> Playing History -> Hand History) and the PokerStars client needs to be running in English (PokerStars Client -> Settings -> Global -> Language -> English). Once that is setup you can test this on a table by clicking 'Play Poker -> Get Hands While Playing' and after you play your first hand it should get imported and the name be available for selection in PokerTracker 4.
If you need further assistance report this to us in a
Support Ticket with your log file and
screenshots of the following windows:
1. "Settings -> Playing History -> Hand History" in PokerStars.
2. "Configure -> Sites & Import Options -> Site Configuration -> PokerStars" in PokerTracker 4.
Guide: How to Create & Submit a PokerTracker4.log File