Update
A clean css solution as suggested by Hashem Qolami is much better and unintrusive. I honestly didn't thought of such approach but already wrote 90% of my answer. I recommend that you go with it!
The textbox is using a placeholder tag, which gets automatically cleared the moment the user starts writing. I recommend that you leave it this way because it's not an entirely unexpected behavior. Most users are used to either situation where the text would disappear the moment you start writing or the moment you click on the field.
Shortly, it serves as a reminder or pointer what is it to be entered in this field.
The placeholder attribute specifies a short hint that describes the
expected value of an input field (e.g. a sample value or a short
description of the expected format).
The short hint is displayed in the input field before the user enters
a value.
Note: The placeholder attribute works with the following input types:
text, search, url, tel, email, and password.
If you still want to clear it the moment you click, you will have to use some sort of javascript. If you can directly edit the plugin in some way, you can add those to the check box:
- onfocus="this.placeholder = ''"
- onblur="this.placeholder = 'Get notified when its ready via email"
If you cannot edit the plugin, you will have to do insert some javascript on the page, something in the lines of:
//Clear placeholder on focus;
$('.subscribe_form .email_input').focus(function()
{
$(this).attr('placeholder', '');
});
//Restore the placeholder on blur (loss of focus)
$('.subscribe_form .email_input').blur(function()
{
$(this).attr('placeholder', 'Get notified when its ready via email');
});