If you want to change certain aspects of your theme, you should get familar with its different files.
Here are a few of your theme’s key template files and their specific purpose:
style.css– controls the compositional and stylistic presentation of your site
header.php– displays the header area of your web pages, which generally includes your blog title, tagline, navigation, and other “upper” elements
index.php– loops through your post content and displays different elements, such as the post title, date, and content
wp-comments.php– displays each post’s comments, pingbacks, and trackbacks, as well as the comments-submission form
single.php– similar to
index.php, but displays a single post instead of multiple posts
There are numerous ways to go about editing these files, but perhaps the easiest way is to simply use the built-in Theme Editor from within the WordPress Admin.