Add logo to (lightbox) login and register form

Hi,

you can do that with CSS. You iwll need to add it to Appearance > Customize > Custom CSS.

This for example, will add the logo of our GetPaid plugin to both modals:

h5.modal-title::before {
    background-image: url(https://wpgetpaid.com/wp-content/themes/ayetheme-new/assets/img/gp/getpaid-logo.png);
    width: 155px;
    height: 37px;
    display: block;
    float: left;
    margin: 0 20px 0 0;
}

Things you will need to change are:
the URL of the image that you want to show

the width and height of the image and the margin in case 20px is too much or not enough space between the logo and the modal title.

Let me know if that works for you.