If you want to bulk delete your schedules before they gets posted or the post already posted on Instagram, Facebook and Twitter, you can follow this guide to bulk delete.
Step 1. Go To App Setting Page
At Apphi App homepage, go to Settings > Bulk Delete Schedules
Step 2. Select The Schedules That You Want To Delete
Choose account name that you want to modify and select schedules that you want to delete.
After selection, tap Delete to finish.