Collectible Card Game Headquarters

Hey is there anyway to put a non-legendary card into the commander board? And have it act as my commander?

On Windows:

1) Create your deck. For now, use a temporary commander, and put your intended commander in the 99.

2) Follow this path, replacing C: with whichever driver Forge is saved in:
C:\Users\<your_username>\AppData\Roaming\Forge\decks\commander
(can also be accessed by typing %appdata% into your Windows search bar)

3) Find the deck you created, open it with a text editor like notepad.

4) Replace the row under [Commander] with the exact phrasing used for your intended commander. It should look something like this:

[Commander]
1 Ajani, Strength of the Pride|M20
[Main]

Hope this helps.