Create your shape, right-click and select Format Shape.
Format the Fill Color and Transparency first, and then format the Line Color second as I showed you in the two screenshots.
Basically, all you are doing is apply two sets of format options to the same shape.
You use the Fill color and transparency to highlight the text and the Line color for the outline of the shape.
For the screenshot, save it in your Pictures folder using the Snipping tool, then click the paper clip in your post to open the Manage Attachments window.
Browse to your screenshot then click Upload.
When the upload is complete, close the Manage Attachments window then click the paper clip again and click the link to your image to insert it in your post.