Hey Carolina,
Thanks for posting in the forum. In trying to access that provided link, it looks like that page is no longer active. Would you be able to provide us with another link to an active portion of your site, that has that non-working sign up form? This will allow us to take a look at the site it’s on, and also try to replicate the issue on our end.
In regards to ‘removing’ the email adress label, if you only have the one single email address field visible on your form, you can make it hidden by using something like this:
#mc_signup_form .mc_var_label {
display: none;
}
This will effectively make all labels on your form hidden.
I’m afraid that the plugin doesn’t provide a direct option of placing the label/placeholder text inside of the input field of the email address. Instead, you may consider using the workaround/alteration that one of our forum’s posters suggested in this thread here:
https://www.ads-software.com/support/topic/plugin-mailchimp-list-subscribe-form-request-add-placeholder-text-for-mailchimp-widget?replies=21
For CSS, you should be able to style the form with your own CSS by using the developer tools on your browser and finding the CSS classes/ID’s that you need to make declarations for. Once you have those identified, you should just be able to place that CSS code on your WordPress Theme’s stylesheet.
If you have any questions, let us know!
-tk