Having some issues

As you can see, the options I'm looking for to add textures to my terrain don't work as it should. What am I doing wrong here?
well, why did you accept my answer? you could have just edited your question because it seems to me it wasn't answered to your understanding: http://answers.unity3d.com/questions/1175060/unity-seems-to-be-in-2d-but-i-want-it-in-3d.html#comment-1175327
and since you've trouble with this i made a small video, which should show it to you: (click on this blue text)
Answer by Graphics_Dev · Apr 23, 2016 at 02:37 PM
That's perfectly normal. Just click the select button in the little texture box from the popup and select your desired texture.
Let me know if this helps =)
Answer by SoundPuppy · Apr 23, 2016 at 01:10 PM
click on your image in the assets so it is in the inspector and choose terrain then choose it
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