How to validate password?

Hi, i want to make a web page for user change your password, if they use the sparkweb, there is not a way to do that, (no?)

How I validate the user password before change it?

Thanks in advance

Hi, i want to make a web page for user change your password, if they use the sparkweb, there is not a way to do that, (no?)

How I validate the user password before change it?

Thanks in advance!!