Diskarma Ritual
Ritual Spell Card
[REQUIREMENT] None
[EFFECT] Ritual Summon “Transam Diskarma Linac” by sending face-up monsters on your field to the GY whose combined levels total 11 or more. (You cannot use more monsters than necessary to Ritual Summon)

Yudias explains you send face-up monsters from the field to the GY as material whose Levels total or exceed that of the monster you’re trying to Ritual Summon.

In this case: 6 + 4 + 1

Transam Diskarma Linac
Level 11 LIGHT Galaxy Ritual Effect Monster
ATK 3000
DEF 1600
[REQUIREMENT] During the turn this card was Ritual Summoned, send the top card of the Deck to the GY.
[EFFECT] All face-up monsters on your opponent’s field lose 1000 ATK x [The number of monsters used as material to Ritual Summon this card]. For the rest of this turn, this card can make attacks on monsters up to [The number of monsters used as materials to Ritual Summon this card].

Worth noting: The Official Anime Twitter Account cites that the sending is meant to be aesthetically ‘Tributing’.

However, it is not stated where a Ritual Monster goes but it does not appear to need to be in the hand.