If you want to use an specific package, outside the ones that come bundled with the Spyder installer, you will need to create a Python environment with your package installed, along side a compatible version of the
spyder-kernels package, and set the Python environment interpreter as a custom interpreter from the Spyder preferences. For more details on the process to follow to use specific packages with the Spyder installer and some other usual questions on how to use Spyder in general you can check the Spyder docs FAQ page:
Frequently Asked Questions — Spyder 5 documentation (spyder-ide.org)