Hello everyone! It's me, Ella. (bonitarogue) 

I have received questions on how to make a watermark on my personal account.
Today I'll be doing a step by step tutorial. Let me know if you guys don't understand and I'll try my best to help. 

Remember: make sure that that the background is white and the ink is black.

First Step:

Open Photoshop and click on the "Default Photoshop Size".

Second Step:

Click on the brush tool. Remember!! The ink must be black..

Third Step:

Choose your desired shape (circle, square, etc.) /brush.

Please note that I have downloaded these brushes from Deviantart. 
(Just search for circle brushes or brushes. If you're too lazy, you search for Circle PNG and paste it.)

Fourth Step:

Add your desired font and your initial/ name on it 

Fifth Step:

Once you're satisfied with your results, Click on <Edit> and <Define Brush Preset> and press <OK>

The finished product:

Thank you guys for reading! Hope you guys find it useful.

[ Tutorial by BonitaRogue ]