In any module, chooseEdit > Edit Watermarks(Windows) orLightroom Classic > Edit Watermarks(Mac OS).
If you have multiple photos selected in the Filmstrip, click the Left
and Right navigation arrow buttons to preview the watermark on each photo.To save the current settings as a preset and exit the Watermark Editor, click Save.
To save the watermark and continue working in the Watermark Editor, click the preset menu (in the upper-left corner of the window) and choose Save Current Settings As New Preset. Type a name in the New Preset dialog box and click Create.