If you have just ordered your Valheim server from HostEZ, we reccomend reading the following resource to help with your setup.
Please be sure to read your HostEZ welcome e-mail to ensure that you have access to the Pterdactyl control panel. You cannot make changes to your server settings via the customer portal.
Additional Resources for setup:
Adding yourself as an admin ingame:
Server commands list for ingame admins:
https://ag.hyperxgaming.com/article/11422/valheim-server-commands-list - Note: commands that require "cheat" mode are not available on dedicated severs.