Editing info in author box

Hi,

I've used suggestions in previous help threads to show an author box at the end of my posts. It's pulling both the picture and the bio from Gravatar.

Basically I want to know how I can edit the bio itself instead of pulling it from Gravatar as I want to add some links to other platforms eg LinkdIn, social media handles etc at the bottom of/under the bio?

Or alternatively keep the Gravatar bio and add a line of code to include the weblinks?

I'm using both Hook & Css

Hook:

<div class="author-box">
	<?php 
	
	global $post;
	
	?>
	
	<div class="avatar"><?php echo get_avatar ( get_the_author_meta( 'ID' )); ?></div>
 
        <h5 class="author-title"><?php printf( esc_attr__( 'About %s', 'the author' ), get_the_author_meta( 'display_name') );?></h5>
	
				<div class="author-summary">
	
        <p class="author-description"><?php echo nl2br( get_the_author_meta( 'description' ), null ); ?></p>
 
    </div>
 
</div>

CSS:

.author-box {
    display: -webkit-box;
    display: -ms-flexbox;
    display: flex;
    -ms-flex-wrap: wrap;
        flex-wrap: wrap;
    padding: 4%;
    margin-top: 60px;
    font-size: 0.8em;
}

.author-links a {
    font-size: 3em;
    line-height: 0.5em;
    float: right;
}

.author-box .avatar {
    width: 30px;
    border-radius: 100%;
    margin-right: 20px;
}

h5.author-title {
    margin-bottom: 0.5em;
}