You can obtain the HTML code for SFI banners here: https://www.sfimg.com/Resources/Marketing/StandardSponsoringAids
Both self-hosted Wordpress blogs and Blogger have widget areas where you can copy and paste that HTML code.
Wordpress.com has regulations about commercial use, so you may want to check and see if you are allowed to post banners there.
On Blogger you can click on the "Layout" tab, and on Wordpress you go to "appearance" and then "widgets." Paste your banner HTML into a text box that allows HTML. Be sure you select a banner that fits in the area you are working with. One of the skyscraper banners or box banners works well for your blog sidebar, and the 468x80 banners can go in those areas that are sized to allow them. If your banner is too big for the space, it will look bad and reflect badly on both you and SFI, so make sure it fits!
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You can obtain the HTML code for SFI banners here: https://www.sfimg.com/Resources/Marketing/StandardSponsoringAids
Both self-hosted Wordpress blogs and Blogger have widget areas where you can copy and paste that HTML code.
Wordpress.com has regulations about commercial use, so you may want to check and see if you are allowed to post banners there.
On Blogger you can click on the "Layout" tab, and on Wordpress you go to "appearance" and then ...more