"Is there facility available for being able to edit your own shouts on this forum?"
Unfortunately we can't get that granular with the permissions for the Tiny Portal shoutbox. It's either all or nothing. Enabling a user to edit posts gives permission to edit everyone's posts.
Are you sure? if you go into 'Profile' then 'View Shouts' you'll see an 'Edit' section next to your shouts - my question was about account permissions.