How to Turn off the Screen Rotation Lock on the iPhone

Press the 'Home' button twice. The multitasking status bar opens at the bottom of the screen.
Flick the multitasking status bar to the right reveal the iPhone's iPod controls and the rotation lock. The rotation lock icon is located to the left of the iPod controls. A small lock symbol appears on the icon when the rotation is locked.
Tap the rotation lock on. A brief 'Unlocked' message appears. The small lock symbol does not show on the rotation lock icon.
Press the 'Home' button to close the multitasking status bar and return to your Home screen.
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How to Fix Error 21 on an iPad

Make sure you're logged in to your computer with an administrative account. If you're not certain, log out and then log in with an admin account.
Update to the latest version of iTunes on your computer by clicking the iTunes 'Help' menu and selecting 'Check for Updates.' If you don't see the Help menu, press 'Ctrl-B' on the keyboard to reveal the Menu bar.
Update Windows. If you don't have Windows' default automatic updates enabled, install any updates manually. Press the 'Windows' key from the Start screen, select 'Settings and then 'Change PC Settings.' Select 'Update and Recovery,' followed by 'Windows Update.' Click 'Check Now.' If there is an update available, follow the onscreen prompts to install it.
Confirm that any security software you installed on your computer is up to date. Windows security software is updated when you do a Windows update.
Unplug all USB devices connected to your computer except for the keyboard and mouse. Examine the iPad's Lightning cable to ensure it is in good repair and then plug it in to a USB port you know is working properly on the computer .
Restart the computer and the iPad. Launch iTunes and try to update or restore the iPad.
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How to Connect Two Macbooks With a USB Cable (5 Steps)

Stand the MacBook Air on a table. Open the MacBook Air’s lid to reveal the LCD screen. Rotate the MacBook Air so that the LCD screen is facing you.
Pull the port access door on the right side of the MacBook Air down with your fingers. Insert the USB cable from the USB-to-Ethernet adapter into the USB slot that is closest to you inside of the port access door.
Stand the MacBook on the table to the left of the MacBook Air.
Plug one end of the Ethernet cable into the Ethernet port on the USB-to-Ethernet adapter that is connected to the MacBook Air.
Plug the other end of the Ethernet cable into the Ethernet port on the side of the MacBook.
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