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Steps to embed a image into your WordPress Site
Create or edit a post on WordPress
To create a new post on WordPress click the Create a New Post button in the top right of the website.
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To edit a previously created post click the Edit link at the bottom of a previously created post.
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Add the image as 'Media' to the post
Click the Add Media button in the top left of the editor
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Add an image to your Media Library from your computer or from a URL using the buttons in the top left of the Media Library window
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If the image is not already selected, select the image you want to embed by clicking on its thumbnail
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Once an image is selected it will be highlighted in blue (see above image)
Click the Insert button in the lower right of the Media Library to embed the image
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You should now have an image embedded in your post
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For more information embedding multimedia in WordPress, please refer to their codex: Inserting Images into Posts and Pages