Email recipients send selector or Disable email recipients for Announcement App

[JKOH]

can anyone help me I already made an app but I can't create a selector and a disabled email recipient basically what this app do is like it can save email after email is saved the announcement will send emails to the saved emails recipient, but I don't have an email recipient selector or a disabled email selected recipient so that I can only select people I want to email please if anyone can help me new here in Appsheet hehe.

<Image containing PII removed by staff>