How Do I Add a Thumbnail to WordPress?
Adding a thumbnail to your WordPress blog can make your content look more appealing and help you attract more readers. To add a thumbnail, go to the Posts screen and click on the Add Media icon. You will then be prompted to choose a file from your computer. Click on the Browse button and locate the image you want to use. Once you have selected the image, click on the Choose button. You will now be asked to select a size for the thumbnail.
Click on the Choose button and choose a size that will fit the image you have selected. Once you have made your selection, click on the Upload button. You will now be taken to the Thumbnail Gallery screen. Click on the Add Thumbnail button and select the file you have just uploaded. Once you have added the thumbnail, click on the Publish button.