Plezmo Support

hi

I want to know how to make a program that takes the input from the people (unlimited) and stores it forever until i delete

how can we save data like username and password in app programming, then how it will be check for login

You can store data forever in local data or cloud data.
Here are the detailed steps:

https://support.plezmo.com/support/solutions/articles/65000070209-3-13-local-data

https://support.plezmo.com/support/solutions/articles/65000070238-3-14-cloud-data

For checking username and password you can check with the help of conditional statements.
https://support.plezmo.com/support/solutions/articles/65000068421-3-2-condition