There are a few things you can do to prevent an Instagram user from uploading a photo without permission. First, make sure that your account is set up to allow users to upload photos. If it isn’t, you can set up a password protection feature on your account so that only authorized users can upload photos. Additionally, be sure to check your account’s settings and make sure that you’re allowed to post photos before uploading any. Finally, be sure to follow the Instagram guidelines for posting photos and be aware of the rules about using hashtags.