delete more emails at once

How can i mark more emails to delete at once?

Hello jelena. You click on the first  from the list, you press the Shift key. 
Then you turn the wheel to get the last one to 
delete and you click on the Delete key

JPM

Yes, as Jean says, the Windows default selection process is what you use. Using Shift+click for consecutive messages, or Ctrl+click for others.