How Do I Lengthen the Name field on the Sign-up Form

I had to join my site, to capture the field CSS identifier. Unfortunately, and I thought this, there is no specific CSS class for a specific field. So, this solution could be a bit risky. What it should do: Capture the first field, only. But, I can't guarantee it. However, since I am using such a specific CSS identifier, it might work. It won't "break" anything. But, could get confusing if this format is performed anywhere else - - it shouldn't.

I am making the width of the first field label, larger, using CSS.

At this CSS to your custom CSS box:

.xg_widget_main_authorization_newProfile form#profile_form div.xg_module.xg_lightborder div.xg_module_body.pad fieldset.nolegend.profile dl dt:first-child {
    width:500px!important;
}