# Sign

Every change of the system state must be confirmed with a user signature. A change can be e.g., a user email change, measuring point calibration adjustment or alarm acceptance.

History of all the changes is stored in database for further reference.

When signing is needed, a “User Sign-in” form is opened.

![](https://content.gitbook.com/content/EANwXRnuP0ug8971viyg/blobs/OlHyVDcB4cv66mKAtpFw/image18.png)

To sign:

1. Enter your username and password.
2. It is good practice to enter a comment that explains the reason for a change. It is possible to make a comment mandatory for a System Group.
3. Click “Sign” button.
4. The system shall confirm the change was done.

![](https://content.gitbook.com/content/EANwXRnuP0ug8971viyg/blobs/4u32oeiIWX7rx6rssroi/image19.png)
