On a PC:

Assuming you have Java installed, (if not go to https://java.com/en/download/) on your computer search for Java Control Panel or Java Console. Open the Control Panel. Go to the Security tab. In the Exceptions Site List select the Edit Site list button. Click on the Add button and enter ‘http://introchem.chem.okstate.edu’, then click the OK button. Click OK to exit the Control Panel. You should be able to access the simulation after following these instructions. It is possible you may have to quit your browser and re-open the web site.

On a Mac:

Assuming you have Java installed, (if not go to https://java.com/en/download/) go to System Preferences. Near the bottom you will see a Java icon. Open the Control Panel. Go to the Security tab. In the Exceptions Site List select the Edit Site list button. Click on the Add button and enter ‘http://introchem.chem.okstate.edu’, then click the OK button. Click OK to exit the Control Panel. You should be able to access the simulation after following these instructions. It is possible you may have to quit your browser and re-open the web site.