How to fix Sign In option in WordPress

I have a WordPress site with “Sign In”option right side top: https://www.chicago-plastic-surgeons.com/
I want that when login in my WordPress site the then display a “Log Out” option only and “Sign In” would be disappeared like this: https://www.chicago-plastic-surgeons.com/events/

This is my code:

<div class=”fix floatleft sign_in”>
Sign In
Log out
</div>

How could I fix it? Thank you.

N.B. Recently I have changed my site home page. So, I have already created and customized wp-login.php file in WordPress directory. I just want to use link form there which I mentioned in my code.