You can add "click here" or "buy now" wording to your image in Book Brush however it’s not possible to embed a working hyperlink directly into an image file (.png or .jpg). Those image formats aren’t universally clickable.
Clickable links are added afterward, in the platform where you upload the image. For example, if you want the image to link somewhere on Facebook, you’d add the link directly in your Facebook post — not within Book Brush.
If you’d like a little extra guidance, try searching “How to make my image clickable on [platform name]” for platform-specific tutorials or short YouTube videos that walk through the steps.