How can I enable SSL for my nopCommerce?

I have certificates installed already but how can I enable it for nopCommerce, it's not switching to HTTPS from HTTP. please what am I doing wrong?

Well no one answered but I kind of figured it out. It's enabled in the web.config by setiing use SSL to true in the AppSetting section. In case anybody has the same problem.

In addition to the settings in the web.config, you have to install a certificate in IIS also.