Click the Widget on my Blog
Select the Countdown Widget that you LIKE (there are many to choose from select from the left)
Click the link under the widget you have chosen
Click & Choose your date and enter your text
Once you have entered your text
Scroll down to the bottom of the page and you will notice a box that says:
Copy the html etc
Select all the text and copy IT
Now...return to your blog
Click the Design Button at the top of your main blog page
Select the layout button
Click on Add Gadget
Click the plus sign button, paste your countdown URL in the box
and SAVE IT!
View your blog....your countdown is ready to GO!