To update your password, enter a new password in the password and verify password box.
Please make sure that you enter the password in both boxes, this is to ensure that you have typed it correctly.

Your password is encrypted before storage and cannot be shown in plain text.

Nope.
You can update your details as required, just leave the password boxes empty.

At the moment you cannot, just give us a call on 01256 520999 and we will re-enable that for you.