I just can't get my head around what Kant means by "transcendental" in the term

I just can't get my head around what Kant means by "transcendental" in the term

I just can't get my head around what Kant means by "transcendental" in the term "transcendental idealism". Can you help? Also, Kant CAN"T be serious suggesting that we create space and time! If I create it, how did YOU get in my space-time and I in yours? After all, we're talking to, and recognizing each other. (Not sure I'm even understanding this really). Also, idealism seems, as Popper says somewhere, very anthropomorhic. We think we are so special, so crucial to reality. My, we are quite full of ourselves.---Baffled.

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