To delete messages on snapchat you can follow the below-provided steps. These will decently help you to remove messages on snapchat.
The best way to Unsend and Delete Snapchat Message
In the very first step, to delete Snapchat Messages, you have to open the Snapchat application, available on your phone.
After opening the snapchat application, you are required to go to your profile by hitting on the bitmoji, available at the top left.