This is how to protect your wifi network using wireless mac filter. This is an additional feature or protection for your wifi or Internet. This is not about how to password protect your wifi.
This is a step by step tutorial on How to Add Emails from Other Accounts Like Webmail Through Your Gmail Account Using POP3.
How to make Samsung Galaxy Tab display screen auto rotate or flip? Tap on Settings. Scroll down to the bottom to look for Accessibility; tap it. Check the box on Auto-rotate Screen.
Try BitDefender’s free online virus scan. It’s online and it’s for free. https://www.bitdefender.com/quickscan/