Log into your Senso Console - https://portal.senso.cloud/
Select the appropriate folder from the Groups window that contains the desired devices.
Select the users or devices you wish to lock
Click on the Lock Screen icon from the toolbar located towards the top of your browser window.
From the Action drop-down select to either lock or unlock the screen of a device.
If you are locking a device any text in the Lock Message field will be displayed whilst the device is locked. If you are unlocking a device any value entered in the field is ignored.
Click Confirm to perform the action you have selected.
Please refer to the article on creating Shortcuts to save Custom messages for repeated use.