How to remove the "get start" button?

Hello Michelle ! 
To remove the “Get Start Now” button, you can do as the following:
1. Install the Jetpack by WordPress.com plugin.
2. Setting Jetpack then enable the Custom CSS feature.
3. Move through Appearance > Editor Css, add the following code:

   .banner #get-started {
    display: none;
}

Hope this helps !

Hi Michelle,
To make a link please follow my instruction here:
1. Open header.php file in /wp-content/themes/dw-timeline/templates/header.php 
2. Replace following code – line 40 

   <button id="get-started" class="btn btn-default btn-coner"><?php echo dw_timeline_get_theme_option('get_start','Get Start Now') ?></button>

with:

   <!-- <button id="get-started" class="btn btn-default btn-coner"><?php echo dw_timeline_get_theme_option('get_start','Get Start Now') ?></button> -->
 <a class="btn btn-coner btn-default custon-link" href="#">Get Start Now</a>

3. Add following code to header code in Dashboard / Appearance / Customizer / Custom code / header code 

   <style>
.custom-link {
position: relative;
z-index: 1;
margin-top: 20px;
padding-left: 30px;
padding-right: 30px;
}
</style>

Hope this helps!