Enable button when password is correct

Hello.,

I am new to WIX and html.,

I have created a website for own Salon and I have created a page with lots of images.

I want to show the page to customer if only 3 text fields or atleast 1 password field is filled. I have created 3 text fields 1.Name 2. phone , 3.password (which will be provided by us) and if password is correct then he/she will be directed to gallery page.

I dont know how to disable button and enable again when password is validated...

please help

urgently...