How can I prevent multiple submissions?

Quiero que mi planilla de suscripción o membresia cuando una persona se registra no lo puea hacer 2 veces no lo duplique

From how I understood it, you want to prevent multiple submissions. There are 2 ways to do that so I'll enumerate them all:

1. Set the Unique Submissions option. You can check cookies only, or cookies and IP.

Complete guide: How-to-Set-Unique-Submissions-on-a-Form

2. Another way is to add a Captcha Field to your form so users won't and can't accidentally submit multiple submissions.

Complete guide: How-to-Add-a-Captcha-Field