You can select multiple messages individually by holding the Crtl key while you select each message.
You can also select an entire group of messages by selecting the first message, holding the Shift key, then clicking on the last message of the group.
Once you have selected the messages you wish, right click on one of the highlighted and select your action from the menu.
Alternately, you may wish to enable check boxes next to the messages within your Inbox. To do so, please follow these steps:
- Click the "Preferences" link in the upper right corner of the email screen.
- Click the "General Settings" link under the "Email" heading
- Click the "yes" button next to the option marked "Use checkboxes to select emails"
- Click the "Save" button in the upper left corner of the "Preferences" module