How do I make the Doctor regenerate?

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In Lego Dimensions, once you finish the Doctor Who DLC, a message flashes up saying "The Doctor can now regenerate!" ...And then I didn't manage to read the rest of the message before it disappeared.
How do I unlock and use this ability? When I walk into the TARDIS, the panel on the left-hand side has a menu of Doctor regenerations - but they are all locked when I access it.
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How does the Doctor keep regenerating?
The season finale finally answered the Season 11 mystery of the Timeless Child and revealed the news that The Doctor was not actually a Time Lord or even from Gallifrey. She was adopted by a Gallifreyan named Tecteun, who discovered the child had regenerative capabilities after a fatal fall off a cliff.How do you regenerate as the Doctor in Lego dimensions?
He travels through time and space, saves the Earth, and has millions of fans all over the world. But as every "Whovian" knows, the Doctor cannot last for ever: Time Lords are able to regenerate only 12 times before they die.Can the Doctor regenerate infinitely?
The idea that the Doctor has 12 regenerations is first mentioned in The Deadly Assassin, a 1976 episode from the Tom Baker era. The Master - an evil Time Lord close to his final regeneration - is said to have been offered a new cycle of lives in exchange for helping to rig the election of a new Time Lord leader.Doctor Who REGENERATION EFFECT tutorial | After Effects, no plugins
Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.
Images: Andrea Piacquadio, Karolina Grabowska, Karolina Grabowska, Karolina Grabowska