If you want to change the thumbnail on a blog post, there are a few different ways that you can go about it. You can use an online tool like Thumbnail Maker or Picasa, or you can use a standalone program like Photoshop.
To use an online tool, like Thumbnail Maker or Picasa, first choose the image that you want to use as your thumbnail, and then click on the “Create Thumbnail” button. This will open up a window where you can choose the size of your thumbnail, as well as the resolution of the image.
To use a standalone program like Photoshop, first open up the image that you want to use as your thumbnail, and then select the “Thumbnail” option from the toolbar.
Once you have chosen these options, you can then start to crop your image into a thumbnail format. To do this, first select the portion of the image that you want to keep as your thumbnail, and then drag it down into the “Thumbnail Size” box.
You can also enter a width and height value into this box if you want your thumbnail to be square in shape.
Finally, you will need to choose a resolution for your thumbnail. If you are using an online tool like Thumbnail Maker or Picasa, then chances are that they will already have selected a resolution for you.
If not, then you will need to enter in a resolution value into the “Thumbnail Resolution” box.
Once all of these values are entered into the appropriate boxes, just hit OK to create your new thumbnail. Depending on which program that you are using, this process may vary slightly, but the end result should be a thumbnail that looks similar to what is displayed in your original image file.