Till now Bitwarden does not support entering credentials into programs.
The latest official answer (from November 25th) is:
It’s 100% on our intended to-do list. The goal was to evaluate what options would be available with new password management APIs but not necessarily limit the scope to just those applications.
Absolutely more to come on this!
By the way:
Using the search before creating 2 identical topics would have given you the answer immediately:
https://community.bitwarden.com/t/auto-type-autofill-for-logging-into-other-desktop-apps