There are a few ways to you can access the admin section of your website. The most common way is to browse to yourdomain.com/admin and enter your account credentials to gain access to the admin section of your website.
Depending on your security needs your website maybe enabled with a different admin link than mentioned above. In this case, please find the email your system administrator sent you. This email will contain the secure link to enable you to login into your website.
If you still need help, or are unable to login, please feel free to open a support ticked, and we'll be happy to help.