From a Home screen, navigate: Apps icon > Contacts .
From the Contacts tab, tap the appropriate contact.
Tap Edit contact (located at the top).
Enter/edit any of following information then tap Save (located in the lower-right):
To change the account type, tap the Dropdown menu (located at the top) then tap the desired account (e.g., SIM, Google, etc.).
Available options may vary.
To add a pause (a 2-second delay between numbers) or wait, tap the Symbol key (located on the right side of the keypad) then tap P or W as appropriate.