Survival Secrets Cobalt Jewel

Greetings!

So... I have this lvl 27 witch...
and I got the Survival Secrets Cobalt Jewel, which gives 3 mana/sec + 10% elemental damage.
The instructions are, "Place into an allocated jewel socket on the passive skill tree."

I have Fire & Frost walker, Occultist's dominion, Practical application, etc. plus several smaller passives.

I can drag the jewel anywhere (that I have lit (enabled) already) but it won't drop into any socket, lit or not.

How do I insert the jewel into the passive skill tree???

Ideas appreciated, correct answers even more so!
Look for the near-square shaped blue passives that don't do anything. Those are the Jewel Sockets. The one at the end of the chain.
Cool. Thanks!

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