How to use paint bucket tool in Ms Paint ?
Fill with color tool is used to fill the image or part of an image with different colors.
Step 1: In home tab, select paint bucket tool given next to the pencil tool.
Step 2: You can change the background color to be filled with.
Select Colour 1 option and then click on the color pallete to change the color as shown,
Step 3: Click the portion with the paint bucket tool to fill with the selected background color.
Here, you can view the image filled with red color using paint bucket tool.