First, you must get your Setster code ready. Login into your Setster account and select the "Get Widget" tab. Once there, select the type of widget you want, and customize it's placement and wording. More info on this found here.
Copy the code to your clipboard and now let's add it to your website.
1. Sign into your Blogger account
2. Go to the site
3. Under Layout, select "Page Elements"
4. In the middle of the page, there is a button "Add a Gadget'
6. Name the title Setster
7. Enter the content that you copied from the "Get Widget Code and click "Save"
That is it, your Setster widget is now on your Blogger site.