How do I enable mobile:

You can define a different look and feel of your website for mobile. For defining a different mobile site first of all you need to enable mobile Studio(editor) for your website. Then in mobile studio you can define a different mobile site.
To learn more about Mobile Studio click here.
Go to website settings and check the box labelled mobileEnabled.

Here is how to enable mobile:

Step 1:Click on the gear icon.

Step 2: Click on website settings.

Step 3: Under the General Settings tab, you will find a check-box for MobileEnabled (shown below). If it is checked that means the mobile studio is already enabled, if not then click and check the check-box.

Step 4: Click done.