How were the Yetzikah and the Meshichah performed?
Rashi: Moshe first poured oil on Aharon's head; then he placed oil between his eye-lashes and joined it to them with his finger.
Why does the Torah not mention the anointing of Aharon's sons?
Ramban #1: It can be taken for granted that Moshe anointed Aharon's sons. 1
Ramban #2: It does not record it because it did not take place. Moshe sprinkled the anointing oil on them and on their clothes, but did not anoint them. 2