After SSH key was added to my Heroku account, I was able to go on to my heroku site:
http://silshack-sunhwa.herokuapp.com. The site let me type my first post when I added /admin to this url.
I made some attempts to make a few changes to CSS layout codes to hope to get the site to look better but failed.
Then I later realized thanks to Grant's help that I have to do git push for the changes to be reflected on Heroku site.
So to make a change in background color to Heroku site, I inserted the background color code in the layout.html:
<style>
body {background-color: #FF8C00;
padding-top: 20px;
}
Then, I changed font style to Georgia and font size.
font-family: "", Georgia /*sans-serif*/;
line-height: 1.8em;
font-size: 15px;
font-weight: 400;
}
body, pre, input {
font-family: "", Georgia /*sans-serif*/;
line-height: 1.8em;
font-size: 20px;
font-weight: 400; }
Lastly, I inserted Sunhwa's Blog in the title.
BLOG_TITLE = "Sunhwa's Blog"/* added*/