- Connect to your Webmail via the url https://your_domain_name.tld/webmail
Ex : if your domain is mars.xyz your Webmail is at https://mars.xyz/webmail
- Once on your mailbox, click on the cPanel icon in the extreme middle to redirect you to the Webmail homepage. At this point, you have two choices:
1st case: You click on the small arrow next to your email address in the upper right corner. In the list displayed, click on
Password and Security 
2nd case: Further down the page click on Password & Security
- In either case, enter your new password, confirm it and click Save
