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For a new image in Photoshop you simply select 300 dpi instead of the default 72. The image size with nothing but Hello World typed in the box was 3.71 M, I doubt you can up convert unless it is a vector image.
To set 300 dpi on a photograph, open the image in Photoshop. Click on the "Image" option in the main toolbar, in the menu that appears click on the "Image Size" option. This will open a window allowing you to adjust the settings of the image. In this box go to the "Resolution" fields.
Go to Google and search "Image conversion tools".
Click on the online tools that allow you to convert images to 300 dpi.
Upload your image, convert it to 300 dpi and then download it to your PC.