For this blog post, I will be making a tutorial on how to add/upload custom theme in Blogger. I would suggest you buy and apply a custom theme in your blogger blog. It will definitely have a more professional looking blog and Some provide themes that are optimized for SEO, which will definitely help in your SERP (search engine results page).
There are free and paid theme on the net but a con’s for the free ones is that you have to promote their product or brand
Go to the theme folder you bought/download, right-click on the folder and choose extract all option
FIRST, Go to your blogger blog, search THEME on your dashboard and click it
SECOND, Look at the upper part of the page, you will see a button with a triangle sign within it next to customize and click on it
THIRD, It will expand with a small page and from among them choose/click on the restore option
LASTLY, A popup page restore will be shown and click on the upload text
browse through your computer for the file and add/upload the XML document option from your theme folder