var LIST = document.querySelectorAll(".list") // get all list items
// loop through each element and check for the infoLabel element
LIST.forEach(function(el) {
  var domEl = el.querySelector(".list .itemInfoText.first p.infoLabel") // this checks if the email is added on a particular website or not
  if(domEl === null) {
    LIST.click(); // if email is not added we will fire click event
  }
})

/*

  The above script will select each of the list item automatically if the email is not added in the website.
  However, you can do it one by one as well but since I had almost 500+ website in my LastPass vault I did not want to click 500+ times
  So, use this script if you are looking for each way to selec multiple items in one go. And delete those site from LastPass vault.

*/