This is a neat little trick you could to do spice up the administration experience for your customers if you sell websites using WordPress as CMS.
First of all you’re gonna have to add a new entry/link in your admin sidebar. To do this, you could use a plugin such as Admin Menu Editor or code it manually through your theme
functions.php file by following this instruction.
prompt() dialog which shows some general contact information, in addition to actually firing a
mailto() event if the user clicks OK.
Paste the following code as the target URL for your link. Remember to edit the text/mail/phone etc.
Once that’s done, refresh your admin panel and it could look something like this: