Make Yahoo Mail the default email in Windows or your web browser
When you select a primary "mail to" email in your browser, that email program will be the one that opens whenever you click a contact us link. You can change your browser or Windows settings so that Yahoo Mail is the one that automatically opens.
Firefox is another browser that supports Yahoo Mail as a mail to option. Set up Yahoo Mail as your default mail to in Firefox and it will be the email that opens whenever you click contact us from within that browser.
Google Chrome is one of the web browsers that supports Yahoo Mail as a mail to option. Set up Yahoo Mail for Gmail when require as your default mail to in Chrome.
Another option is to apply the default mailto address on the operating system level. This allows any browser that doesn't have a mail to preference set up, to select Yahoo Mail. You can set up your default email in Windows 10.