Check the Website Source back in to Archie by clicking Save and Exit or Exit:

Other users who try to open the Website Source while you have it open will be informed that they cannot edit the Website Source because another user (you) has it checked out.

For this reason, please do not close the window in which the form is displayed by clicking on the red X button in the top-right corner of the window:

Instead, close the window by clicking on either Save and Exit or Exit. If you close the windows by clicking on the red X button, the window will indeed close, but Website Source will remained checked out to you and other users will not be able to edit it.