There are multiple ways to edit/view an item. First, go to the folders tree view and select the folder where the item is located. All the items for this folder will be displayed on a list situated on the right side of the folders tree.

Then you can do the following:
1. Double click the item that you want to edit/view.

or,

2. Right click on the item that you want to edit and choose the Edit option from the displayed popup menu.

or,

3. Click on the item that you want to edit/view and then click the Edit button on the toolbar (this is the second button on the toolbar).

or,

4. Click on the item that you want to edit/view and then go to File menu and choose Open Item option.

or,

5. Click on the item that you want to edit/view and then go to the corresponding menu (that is if you are in an folder that contains alarms/contacts/events/notes/tasks, then you have to go to the Alarms/Contacts/Events/Notes/Tasks menu) and choose Edit option.

The selected item will be displayed in a new window and you can edit/view it.