From a Home screen, tap Contacts .
Swipe left or right to access apps; steps apply to the default Home mode.
From the Contacts tab, tap the appropriate contact.
Tap the Edit icon (located at the top).
Enter/edit any of following info then tap SAVE (located in the lower-right):
To change the account type, tap the Dropdown menu (located in the upper-right) then tap the desired account (e.g., Phone, Google, etc.).
Available options may vary.
To add a pause (a 2-second delay between numbers) or wait, tap .-( then tap P or W as appropriate.