Use these steps to add email accounts on the LG G3.

Add

1. From any home screen, tap Apps.
2. Tap Settings.
3. If using Tab view, tap Menu > List view.
4. Under 'PERSONAL,'  tap Accounts & sync.
5. Tap Add account.
6. Tap Email.
7. Tap Other.
8. Enter your email address and password.
9. Tap Manual setup.
10. Select email account type, then tap Next.
11. Tap Next.
12. Enter incoming server information.
13. Verify username and password.
14. If necessary, edit the account name or your name.
15. Tap Done.
16. Tap Next.
17. Enter outgoing server information.
18. Verify username and password.
19. Tap Done.
20. Tap Next.

Delete

1. From any home screen, tap Apps.
2. Tap Settings.
3. Tap 'General', then tap Accounts & sync.
4. Tap the account you want to delete.
5. Tap the account name at the top of the screen.
6. Tap Menu > Remove account > OK.