Logging into wordpress is really easy,you can do so by going to admin panel URL.if you don’t know your login url then try one of these:
1. Add login behind your site Url eg: www.example.com/login
2. Add admin behind Url eg: www.example.com/admin
3. Or you can also try eg: www.example.com/wp-admin
You will get login screen as shown below
Fill the credentials and you ca access your admin panel.