How to add images and videos to your blog

Adding Images 

1. Sign in to Blogger.
2. In the top left, click the Down arrow
3. Select the blog to update.
4. Create a new post or edit a post to add images.
5. On the Post Editor, click Insert image .
6. Choose where you'd like to upload the image from.
7. Choose one or more images to upload.
8. Click Add selected.
9. When the image is in your post, click it to change the size, caption, or alignment on the page.

Drag images into a blog post 

1. Create a new post or edit a post to add images.
2. Drag an image from a folder or desktop to the post page where you want it.

Add a video to your blog

1. Sign in to Blogger.
2. In the top left, click the Down arrow .
3. Select the blog to update.
4. Create a new post or edit a post to add a video.
5. On the Post Editor, click Insert a video .
6. Choose the video you want to use.

Note:

• Avoid adding content hosted by someone else without their consent.
• Avoid using copyrighted materials without authorization. Learn more about Blogger’s copyright policy.
• Avoid adding content that violates our content policy. This includes explicit imagery posted without the subject’s consent and hateful, violent, and crude content.

https://support.google.com/blogger/answer/41641?hl=en&ref_topic=3339243