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Here it suggests there are 10 Upanishads embedded in the Rig Veda.
I have scoured Google but have not found anything saying something like "The 10 Upanishads of the Rig Veda are located in Hymns #X, #Y, and #Z". Where are they located in the Rig Veda???
BTW, what do all these columns mean? How do I go about finding the Upanishads in the Rig Veda, or these other columns?
In a narrow/strict sense, Vedas means Samhitas only while in a broad sense (According to Mimansas), Vedas means Samhitas, Brahmanas, Aranyakas and Upanishads. As I've mentioned in this answer, there are three distinct opinions among scholars whether Upanishads are part of Vedas or not.
All you want to know is about Shakhas of Vedas. As explained in this answer Samhitas of Vedas are divided in Shakhas and rest of Vedas (Brahmanas, Aranyakas and Upanishads) are associated with Vedas through these Shakhas. Each Shalhsas is said to have their Brahmanas.
Principal Upanishads can be found in Aranyakas or in Brahmanas not in Samhitas of Vedas (except Isha Upanishad which is part of Yajurveda Samhita). You can read those 10 Upanishads associated with Rigveda on Vedanta Shastras Library. Where you are searching is the Samhita of Rigveda in which Upanishads are not located as I have said Vedas usually means Samhitas of Vedas.
It may be worthy to mention that out of 10, Aitareya and Kaushitaki are principal Upanishads.
