This tool lets you post your PhotoPad artwork to your Twitter account. To compose a Tweet, click the Twitter icon on the Share tab.

The first time you click on the Twitter icon, you will be prompted to authorize. Once you have authorized, you can post to twitter.
Use the text box to add text to your Tweet. Note that this is an optional step, and leaving this text box blank will post the image without any text.
Click the Tweet button to post to Twitter. Once the image has been uploaded and posted, a browser will open to Twitter so you can view your Tweet.