1. Removing The Existing Font

  • Go To Blogger >>  Template >> Backup Your Template
  • Click Edit HTML and Search For The Following Code
fonts.googleapis.com
  • Mostly, This will be available below <head> of the templates.
  • After finding the above code, you'll see it in the html <link> tag like the image below. 
  • Just remove that html link tagline.
  • Save Template.

2. Installing New Font in Your Blog

  • Go to Google Fonts and find the best font that you want to use.
  • After choosing font, click on "Quick use" button, shown in the image below.
  • Tick mark all the styles
  • Scroll down and copy the html link tag code.
  • Go To Blogger >> Template >> Edit HTML
  • Search For <head>
  • Paste The Code Below It and Save Template.
  • If it gives error, try adding / before > at the end, after that ending will be like />.
  • Okay, now font is installed and lets call it in our template.
  • Come back to Google font page and scroll down more.
  • There, you'll see the block like below.
  • Copy that code and Go To Blogger >> Edit HTML
  • Search for body { or body{
  • There you'll see font-famiy:bla-bla-bla;
  • Remove that font-family property till semicolon and paste the new one there.
  • Save Template.
  • If the font is not working properly now than add the following code above ]]></b:skin>
body, h1,h2,h3,h4,h5,h6 .post, .post-body, .content-wrapper, .main-wrapper, .outer-wrapper, .footer-wrapper, #content-wrapper, #main-wrapper, #footer-wrapper, #rsidebar-wrapper, .sidebar-wrapper {FONT FAMILY PROPERTY HERE!important}
  •  Paste the font family property in the highlighted and remove semicolon because we've added !important tag that will call the font importantly in the given areas.
  • Save Template 
  • You're Done!
  • Welcome New font!