If a form is locked when you attempt to edit it, a popup message is displayed:
The Form Locked popup message displays additional information about the locked form such as the user who has the form locked, the user's real name, and the workstation/device.
To see this information again after closing the popup, tap See More Details in the upper right-hand corner of the screen:
Once the form has been unlocked by the user, tap Refresh. If the form is unlocked, it will become available for editing.