dlorde,
- How can intelligent life find itself a universe capable of supporting intelligent life if there is only a single universe?
Intelligent life doesn't 'find itself a universe'. It evolves in whatever universe exists that has the parameters to support life.
Life is a result of the life-permitting parameters, not a reason for the parameters' existence.
Just like the puddle existing is a result of water being in the various shaped holes described above, it's not a reason for the holes to exist.
Whether or not other universes existed prior to this one, or exist in the same timeframe as this one, or might exist in the future, is immaterial to that fact.
A universe does not have to be observed to exist, but it is trivially true that to observe a universe, there must be observers.
It so happens that
this universe exists, and on this small insignificant planet there were, at one point, the right conditions for life to begin. How it began is not on topic for this thread. 99.9..9% of the universe did/does not have the right conditions for life to begin, but this planet, and probably many others outside our solar system did/do. But the vast majority of this universe is absolutely hostile to any kind of life - in fact most of this planet is hostile to our particular kind of life, which is a good argument against any fine-tuning.
In this universe's case, 2.3 million years ago or so Homo habilis evolved. Eventually H. habilis evolved into H. sapiens - us - and we have the beginnings of agriculture, writing and the Industrial Revolution (amongst other breakthroughs) to thank for the fact that we have time and brainpower to navel-gaze about "why we are here" and "are we individually more special than any other person".
The universe is what it is, whether we are here or not. If humans were wiped out entirely tomorrow, the universe would still be there. If every living thing were wiped out tomorrow, the universe would still be there, albeit unobserved. Life might restart on this planet, or it might not. If it did, then in the ~5 billion years left to this planet, some species similar to ours might evolve, or it might not.
We are not special in the universe, we just have large-ish brains with a capacity for speech and reasoning, and opposable thumbs. We've used our traits to our advantage and have made a success of our existence. But we are no more or less special than any other life form on this or any other planet.
To drag this back on topic: given that we do exist, and therefore we can observe this universe, what does any of this have to do with immortality? You are mistaken if you think that any of the Anthropic Principles support your idea of an individual's continued consciousness after the death of that individual's brain. If you want us to think that there is any likelihood that consciousness could continue, then produce some evidence. Repeatable, testable evidence.