This screenshot shows the Create Tablespace wizard - Step 2 (Add Datafiles).
Datafiles File Name: appts.dbf
Two buttons: + (add) and x (delete)
File Size: 100M
Reuse Existing FIle: (unchecked)
Auto Extend: (unchecked)
There are five active buttons labelled as Back, Show SQL, OK, Cancel, and Next. The Next button is being clicked.