You can easily add a widget to your site or blog and start showing your latests hearts.
To get the widget code you must be logged in. On the upper right corner of the site you'll see your profile picture, your name, a link to your settings page and a link to log out. Click on settings.
On the settings page, chose the last option: "Goodies"
Copy the code for your widget from the page. Just paste this code on your site/blog's code where you want it to appear.
You need to have a basic knowledge of how to edit your site/blog code or template to insert the widget code. Don't try to edit your blog code if you don't know what you're doing.
If you don't know how to do this, get in touch with the administrators of your blog platform (tumblr, blogger. livejournal) and ask them how to insert a widget code on your blog.
Every blog platform is different, we can't help you with your blog/site code.