As my blog is related to festival topic, though I want to change it to the products that will help me to seo. Now can i change the title of the blog once is published. if yes how can i do it?
You go into your site's admin control panel, then change things like the blog name, default URL, etc. Maybe also change the theme, change the default folder/domain name the site's at...
Honestly, it's probably better you just start a new blog about SEO instead. No point just trying to change an old site's content and focus so drastically.
