Under the 'Submit' button in the upper right, you'll find an 'Upload image / Compose' button. You have to start the snap from scratch, but unless I'm mistaken that's how you can re-post it.
Under the 'Submit' button in the upper right, you'll find an 'Upload image / Compose' button. You have to start the snap from scratch, but unless I'm mistaken that's how you can re-post it.