Why add watermarks on your pictures before posting? Internet Users can simply save your photos and can be use anywhere in the net, whatever they want. So, For you to add watermarks
Go to https://www.visualwatermark.com and download the software (You can use other softwares if you want or other ways if you want to). Watermarking is easy; just follow the instructions provided by the software.
What are Watermarks? Tips in adding watermarks in your photos:
https://www.lifewire.com/how-to-watermark-your-photos-493585
https://www.bhphotovideo.com/explora/photography/tips-and-solutions/pros-and-cons-watermarks-photographs