Hi, as I also replied to your email, yes, of course you can show the images in forum.
Note by default all your files on DriveHQ is private, meaning other people won't be able to access your files without your username and password.
However, you can publish your a folder. NOTE you must be a True or Paid member to publish a folder. Once you published a folder, the folder and all files in the it are accessible by anybody with a URL like:
(1) The folder is accessible at: http://www.drivehq.com/file/ShowFolder.aspx?G=1&shareID=YOUR_SHARE_ID
(2) The files in this folder are accessible at:
http://www.drivehq.com/file/df.aspx/publish/YORUSERNAME/YOURSHARENAME/FILENAME.
Please visit the Publish-->Manage My Publish page for more info.