Click the "My Forums" cube.
Choose the forum to which you want to add a new subject and click the "New Topic" button.
Enter the subject and a text. You can add one or more files with the button "Attachment".
You can still delete the attachment by using the "Delete" button.
Click on the "Add" button to add the message. You can now choose an attachment from the files on your computer or tablet.
The topic has been created.