An Adult, 18 and over, must complete an application either online or on paper.
On receipt of the application the person is put into a "pending" status and the applicant and Key 3 will receive an email notice to that effect.
On successful completion of the Adult Leader Selection Process below the applicant and the unit Key 3 will receive an email notice that the new leader may begin as an active participant in the unit.
Keep in mind that the process may take more than a few days. Plan accordingly. A week ahead should be sufficient, and longer if you just moved into the area.