The video will show how to back up and restore WhatsApp messages on Android, such as Samsung Galaxy, Samsung Galaxy Note, LG, Google Nexus, etc.
To delete A Gmail Account on Android is the easiest thing if you follow this step-by-step guide. Surely you will solve your problem with it. If you want more basic settings about Android, go into http://www.android-recovery.net/android-basic-settings-videos.html
This is a video showing you how to set up Gmail on your Android. In this case, you can conveniently send and receive email on your Android anytime and anywhere.