1. Click on the Events tab.

2. Click on Calendar. 

On the Calendar page, scroll down to the event you would like to edit and select it by clicking on the event name. 

Here you can select "Edit" to change the information.

You can then edit the information you desire. When you have finished making your changes to the event, scroll down to the bottom of the edit screen and click on the UPDATE button. You may need to refresh your page in order to see the changes reflected.