Following the link to the Samsung product description a bit further …
That page mentions a "Samsung Health app" without saying which smartphones it supports. On a linked page, way down towards the end, there is a section saying "Download the Samsung Health app now", with links to the Google Play Store and the Apple App Store. That sounds promising.
https://www.samsung.com/us/apps/samsung-health/
There is a manuals and software support page for the Samsung Galaxy Watch FE here.
https://www.samsung.com/us/support/downloads/?model=N0061403
This manual page seems to describe how to use Bluetooth to pair the watch with a smartphone.
https://downloadcenter.samsung.com/content/PM/202406/20240626232032465/EB/WEA_R861_EN_FINAL_240617/galaxy_wearable_app_d1e713.html