1. Starting
-
Open a new document:
-
Size: 900 x 600 pixels

New Document 900x600 px
2. Text Sizing (Signature)
-
(optional) If you’d like to make an Action (Alt + F9) then start recording now:

Recording your Actions
-
Begin by creating a text box with the settings as shown:
-
My text is ‘©m.scott’ in Mistral, BOLD, Italic:
-
‘©’ size: 24 pt: (copy my © symbol!)

Copyright Symbol size: 24 pt

m size: 60 pt
-
‘.’ size: 60 pt and width 75%:

'.' size: 60 pt and 75% for width

'sco' size: 60 pt
-
‘tt’ size: 60 pt and height 81%:

'tt' size: 60 pt and height 81%
3. Text (Website)
-
Now place a text box below your ‘signature’ (same width):
-
Use a font that is all capitals or simply type in capitals – I’m using Copperplate Gothic light, BOLD, Italic:
-
Text size: 12 pt:
-
I’m using a black layer (separate) temporarily to see my text and layout!

Text size: 12 pt
4.a. Saving as .PNG and Applying Watermark
-
You can save it as a JPEG, GIF, PNG anything, however I think PNG is best for quality – doesn’t degrade the data.
-
Simply save this as a PNG!
-
When you want to apply your watermark on an image, open it in Photoshop and go, Right Click (on layer) –> Duplicate Layer… and select the Document!
-
To scale your watermark go, Edit –> Transform –> Scale (hold Shift to keep aspect ratio).
-
Don’t forget to readjust the Opacity – 50% is usually what I apply.
4.b. Defining as a Brush
-
For quick applications of your watermark you can save it as a brush go, Edit –> Define Brush Preset!
-
BUT, you must invert (Ctrl/Cmd + I) your watermark first otherwise you’ll get an error message, because the brush preset interprets the white as transparent.
-
If you do not like the black watermark then you just invert it again in your image once applied!

Source :- tutorialized.com