To add a Featured Image in the Twenty-Seventeen theme on either a post or page, look to the right hand sidebar and scroll to the bottom. There you will see the “featured image” area. Click on the underlined “Set featured image.”
This brings you to the Media Library, where you can either upload a new image or select from images you already have in your library. The Featured Image size is 2000px wide by 1200px high.
Use a simple feature in the Customizer
To remove “Proudly Powered by WordPress” from the Footer, follow these simple steps.
First go to “The Customizer.” You can select the big blue “Customize Your Site” Button, or, if you are on a different page on your site, click on “Appearance” in the left hand menu, then choose “Customize.”
Once you are in “The Customizer,” scroll down to “Additional CSS” (CSS stands for Cascading Style Sheets)
Click on Additional CSS and add this code (see photo below)
Then Click on Save & Publish. At footer the “Proudly Powered by WordPress” will be gone.
You can use one of the footer widgets to put your own content in this area.
If you have questions, please ask below.
Resources for setting up your free WordPress Twenty Seventeen theme: