I think it's pretty easy to do. First, you need to follow some steps.
Here you go:
1. Go to your Snapchat app, then tap on the "profile" icon in the top left corner.
2. Then tap the "settings" icon in the top right corner.
3. Then scroll down and find the option "Delete account" and tap it.
4. Now you have to provide the credentials like USER ID and password, then tap on "Deactivate my account.
5. Your account will be deactivated instantly, and all your data will be permanently deleted within 30 days.
If you change your mind, then you can reactivate your Snapchat account within 30 days only. For reactivate it, you just need to open the Snapchat app, then log back in with your user ID and password. A pop-up message box will appear and ask whether you want to reactivate it. Then tap "Yes". Your account will be reactivated.
