In order to use the CK-12 FlexBook system, you will need to have browser cookies enabled in your browser.

To do so, please follow the instructions below:

If You Use Mozilla Firefox

1. Open your browser.
2. Click "Tools" in the upper menu bar and then click "Options" from the drop-down menu.
3. Click the "Privacy" tab.
4. Check the boxes labeled "Accept cookies from sites" and "Accept third-party cookies."
5. Select "they expire" under the "Keep until" drop-down menu.
6. Click "OK."

If You Use Microsoft Internet Explorer

1. Open your browser.
2. Click "Tools" in the upper menu bar and then click "Internet Options" from the drop-down menu.
3. Click the "Privacy" tab.
4. Move the slider to Medium or Low.
5. Click "OK."

If You Use Google Chrome

1. Open your browser.
2. Click the wrench at upper right and click "Options" from the drop-down menu.
3. Click the "Under the Hood" tab.
4. Select "Allow all cookies" under the "Cookie settings" drop-down menu.
5. Click "Close."

If You Use Safari

1. Open your browser.
2. Click "Edit" in the upper menu bar and then click "Preferences" at the bottom of the drop-down menu.
3. Click the "Security" tab.
4. Select "Always" under the "Accept Cookies" section.
5. Close "Preferences" by clicking the "X" at the upper-right corner of the Preferences box.

Please keep in mind that upgrading your browser or installing new security software or security patches may affect your cookies settings. It is a good idea to double-check browser cookies setting is still enabled if you notice problems when using the CK-12 FlexBook System.