How do I uplift them?

[TengMa]

I found an pre-sentient alien in this plantet....but I can't settle it. is there anyway I can uplift them?

I tried terraforming to remove tile-blocker but it also killed the aliens. is there a way to do it?

 

[Nosforontu]

Its been forever since I have seen a species to uplift but from what I remember, you need to do a handful of things.
1: Have the Uplift technology
2: The species must be within your borders (this may require you to build a frontier outpost in the area to put them in your borders)
3: Go to demographics and find the species and uplift them as if you were genetically engineering them...memory is definitely foggiest on this step
4: I believe you then have to your special projects screen and select the uplift project which will tie up your social sciences for a while until the project is complete.

 

[Pchang]

This changed in 1.4. You have to colonize the planet to uplift now. With this set up, it is impossible. I hope they change this back in 1.5.

 

[Me_]

If it cannot be terraformed, then the answer is: you don't. Post this in the bug report forum.

 

[Chirs]

if you play ironman: you can't.
if you're not playing ironman; select the planet and type this into the console:

Spoiler: command

planet_class pc_continental

it will remove all tile blockers