1. Firstly, click on Template from the menu and select Simple layout and Apply to Blog.
2. From blogger admin, click on Template > Edit HTML from the menu and search for the following code:
</b:section>
Until you've found the code that has class='header':
3. Add the following code after you've found the code above (Add after </b:section>) (Also, change the images link to your own images as highlighted in red below):
<div class='off-canvas-wrap'>
<div class='desktop_head'>
<img class='animated_logo go' src='https://2.bp.blogspot.com/-93K9oSl4-1A/Vt27g6d5sQI/AAAAAAAAASM/1-ERVCT82mM/s1600/cupid.png'/>
<img src='https://3.bp.blogspot.com/-RIZSBnaqZms/Vt27g7xKZKI/AAAAAAAAASI/pPJ9DW5NTNQ/s1600/bg-text.jpg'/></div>
<div class='mobile_head'></div>
</div>