Can month numbers be changed to names?

Sorry we missed this one.

Can you provide a link to your form showing the drop down you want to change the month name on? Are you talking about the date picker, or the "Months" from the "Bulk options" in the drop down field?

If you mean the drop down where months are listed, you can just type in the month numbers yourself rather than using our helper of month names.

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You can save that list you typed in by selecting the "Save as new custom choice" link. Then you will have it for use in the future.

If you are talking about the date picker, that is the standard jQuery UI date picker and can be modified using their instructions. Please provide a link to your form or more explanation and we'll be happy to help.

You're correct about modifying the plugin's CSS file (or any of the plugin files.) Those changes will be lost on upgrade.

A better way is to add the CSS to your theme or child theme's style.css or custom.css (as appropriate.) The trick is to make the rules more specific so they override the forms.css rules.

See this example:
http://gravity.chrishajer.com/contact-us/

That was done with this CSS in my child theme's stylesheet:

[css]
body #gform_wrapper_32 {
width:598px;
border:1px solid #C2C2C2;
padding:5px;
}
body #gform_wrapper_32 .gform_heading span.gform_description {
color:red;
display:block;
text-align:center;
}
body #gform_wrapper_32 .gform_body ul li.gfield {
text-align:center;
}
body #gform_wrapper_32 .gform_footer input[type='submit']  {
color:#FFFFFF;
background:red;
float:none;
display:block;
width:140px;
margin:0 auto;
}

You won't need all that. Just move your rules from the plugin's forms.css to your theme's style.css and make sure the rules are more specific so they override the plugin stylesheet.

If you post the CSS you added to your forms.css file, we can make it specific enough to work in your theme's stylesheet.