Here are the steps to crop an image in Microsoft Paint:

1. Open the image in Microsoft Paint.
2. Click on the Select tool in the toolbar at the top of the program window.
3. Select the portion of the image you want to crop using the Select tool.
4. Once selected, click Edit and then Copy.
5. Click File and click New.
6. In the new image, click Edit and click Paste.
7. Finally, save the cropped image as a new file name. If you use the same name, the original file will be overwritten.

I hope that helps! Let me know if you have any other questions.