If your task status says Edits Requested, this means that either Partipost or the brand managing the campaign wants you to make some changes to your submitted content. This could be editing your captions and text or retaking photos to fit their instructions.
Simply view the relevant task and navigate to the step where an edit was requested. You will see comments from the brand stating their reasons to request edits and which photos to make edits for. If needed, simply delete the photo that you need to edit and reupload your new content. Make changes to your caption if necessary, then tap on the Resubmit button. Your new submission will then be pending for approval again.