On the text console the Compose key does not work in Unicode mode. If not in Unicode mode, regardless of what you choose here, you can always also use the Control+period combination as a Compose key.
Deg tdiwent i d-iteddun, taqeffalt tuddist ur tetteddu ara deg uskar n Unicode. Ma yella mačči deg uskar Unicode, ayen yebɣu yili wayen i tferneḍ, mazal tzemreḍ yal tikkelt ad tesqedceḍ asuddes Control+period am tqeffalt tuddist.