Manage subscription does not work

Hello,

Neither the link nor the page manage subscription work.
Whether one subscriber makes a change of the list, the changes are not made. His subscription remains the same without a change.

For example,

When he visits the manage subscription page, he can select between two lists.
Every selection he makes, there is no change at all.

And another one issue is that when he clicks “Save” after the changes, there should be one confirmation message that changes are made in order to know that all went o.k.

The page I need help with: [log in to see the link]