Register Plugin —doesnt work

Hi, Im trying to customize your plugin to accept more form fields than only accepting email.

I was wondering since ive tried to search for documentation or support of how one could perform such a customization, not finding anything if the registration would grant me anymore options.

The link is broken:
https://www.meacloudserver.com/meastore/register/

Could you please give some details in what i could get out of registering the plugin? Thanks. Looking forward to your answer.

Rudolf

P.S. I left another question before on support regarding customizing the form via css and also adding two other form fields. I would be very thankful for some help.

https://ww.wp.xz.cn/plugins/coupon-promo-code-dispenser-standard-version/