Screen Rotation On the computer there apears to be an option to rotate the screen. When I press the button to rotate the screen it doesn't work. Can you help me?

Hello! you might need to calibrate your tablet`s sensor, if that doesn`t work please turn off the auto rotation on your tablet, and then reboot your tablet. if that doesn`t work, please do a factory reset on your tablet by pressing power button + volume down, your tablet will go into recovery mode and look for factory reset.

What type of tablet? If it's an iPad this is available a few different ways.
If it's an iPad 1 running on iOS5:
1. Check the little toggle switch on the side, depending on your settings this functions as both a mute and a rotation lock. Try changing this.
2. If your toggle was set as a mute control and not a screen lock then the screen lock is kind of hidden. Double click the home button and when the little menu pops up swipe right on it, you should see an option to lock/unlock the rotation.

If you are on a newer iPad
1. Check the little toggle switch on the side, depending on your settings this functions as both a mute and a rotation lock. Try changing this.
2. f your toggle was set as a mute control and not a screen lock then the screen lock is kind of hidden. Swipe up from the bottom of the screen to access the control panel. The screen lock/unlock option is directly on the control panel.

You are looking for an option called Rotation or Rotation Lock (varies by Android version and tablet). Once you find it, orient the tablet so it is in landscape mode, then turn off rotation. If you do not have an option on the bar at the top of the tablet (top pull-down you get by sliding down a finger from the top of the screen), then go to Settings, Display, and look for Rotation, Rotation Lock, or Screen Rotation.

Allwinner A20 is a name of a processor, so I'm not sure what tablet are you using.
There is an option to block rotation, for example if you want to read an e-book while laying on your back. Go to settings and try to find an option to unlock rotation.
Also, some tablets have a hardware (physical) switch on the side that locks rotation.

Hit home button 2 times then slide ur finger copper and click the cerved arrows

You will have to do a factory reset, which will restore the default settings on your device.

1) With the device powered off, press and hold the Volume Up and Power buttons at the same time.
2) When you see the Samsung logo, release the Power button, but continue to hold Volume Up until the recovery screen appears.
3) Use the Volume buttons to navigate the menu and select wipe data / factory reset. Press Home to choose the selection.
4) Press Volume Up to continue.

Unfortunately, this is a new feature from a past update. There is no current way to change the lock button back. However, you can access the screen rotation lock by double clicking home, swiping right, and toggle the screen rotation lock. As a future note, in the next update, you will be able to change it back.

Do you have Windows 10? As there may be an issue with screen rotation.

However to check your settings:

1. Place the tablet into Pad/Tablet mode.
2. Click the Start menu and select Settings.
3. Click System.
4. Click Display.
5. Scroll down and check the status of Lock rotation of this display .

Use the following steps to enable screen rotation lock:

1. Rotate iPad so the display is in the desired orientation.
2. Double-click the Home button to display recently used apps.
3. Flick from left to right along the bottom of the screen.
4. Tap the rotation lock button on the bottom left of the screen.
5. A padlock will appear in the rotation lock button.

u can use once time alt+ctrl+ any type arrow to roated screen