deactivation / activation of the "send" button

HI there :wave:t2: I do something similar on my site. Below is the basic structure that I use, you can adapt it to your needs.

$w('#email1, #password1').onChange(() => {
    if ($w('#email1').valid && $w('#password1').valid) {
        $w("#yourButton").enable();
    } else {
        $w("#yourButton").disable();
    }
})

Good luck!