Student or Learner
Is "We do not allow advertisements in any forms. If you post an image, make sure it has no link of any other websites. We will delete your post without prior notice." correct?
Remember - if you don't use correct capitalisation, punctuation and spacing, anything you write will be incorrect.
Shouldn't the last sentence involve "otherwise?"
Otherwise(if your image has a link to other websites), we will delete your post without prior notice - would be better.
I am not a teacher.