Image Of Zepose Graphic Designers: How Do You Raise The Resolution Of An Image In Photoshop Without Making It Bigger?

Graphic designers: How do you raise the resolution of an image in Photoshop without making it bigger? - image of zepose

I am working on a spreadsheet from scratch in Photoshop (I know that, ideally, the use of Illustrator, but I'm not me) I want the resolution to 300 dpi, but every time I am the size of the image in place. So, I mean the size of the actual image is 1 inch to 10 inches, does not mean that the size of the file. I am confident that the size of the file to download, but how can a small image, while increasing the resolution?