To be able to use bumblebee via the 'optirun' or 'primusrun' commands,
user accounts must be part of the "bumblebee" group.

You can add yourself (or any user) to the "bumblebee" group with:
  # gpasswd -a <username> bumblebee

For more information, please refer to https://wiki.mageia.org/en/Bumblebee.