# User

The user name is shown in the upper left corner of the window. 

<figure><img src="https://2641614999-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F0lFbL66Jd9kHaF8jF97P%2Fuploads%2FdIQU5h9M0IWV32EgnJrd%2Fimage.png?alt=media&#x26;token=dba006ca-e7d6-474e-8ecb-3f3922f41528" alt="" width="135"><figcaption></figcaption></figure>

In case of Boomerang 3 calibration, it is the name of the Boomerang 3 user.&#x20;

In case of manual calibration, it is the name entered into the “Info” form as described in [info](https://help.boomerang3.com/boomerang-3-calibration-app-manual/calibration-app/info "mention"). If the name is not defined, then “Manual Calibration” is displayed.

The user is shown as the issuer of the certificates generated by the app.

Tap the name to log out.

![](https://2641614999-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F0lFbL66Jd9kHaF8jF97P%2Fuploads%2FlT5DjhfbAiq9hmdH8tWw%2F16.png?alt=media)

Tap “Yes’ to log out or “Cancel” to return to the main window.

Log out and log in are needed if you want to refresh the measuring points information provided by Boomerang 3.

Occasionally, the app may lose the logged in state. In such a case just log in again. This will not influence the active calibrations.