You can change your email address associated with your Snapchat account on your iPhone, iPad or Android device. Your email address is mainly used to log into Snapchat or to retrieve your password.
Steps

Step 1. Open Snapchat
The icon is a white ghost on a yellow background.
Type your username and password if you are not automatically logged in

Step 2. Slide the screen down
You will reach your profile page by doing this.

Step 3. Press ⚙️
The button is in the upper right corner of the screen. By pressing it, you will access the "parameters" menu.

Step 4. Select Email Address
This is the fifth tab of the menu.

Step 5. Tap on your email address

Step 6. Enter your new email address
Snapchat will not share your email address with other users.

Step 7. Tap continue

Step 8. Enter your password

Step 9. Click continue
Snapchat will send you a confirmation link to the email address you provided as well as a security email to your old address.

Step 10. Check your emails
Find the confirmation email in your inbox and follow the verification instructions in the email sent by Snapchat.