To add more sites to your account, there are two ways you can do it.

First, you can do it from any view on the platform. 

STEP 1 - On the top of the page, next to the menu, click on the site selector.
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Clicking here will expand details about your current plan, monthly visits and list all the sites you're currently managing. 

STEP 2 - Click "Add New Site" and paste the URL on the pop-up form. 

Alternatively, you can also manage and add new sites through Settings. 

STEP 1 - On the top menu, go to Settings > Site Options > Manage Sites. This view will list all the sites you're currently managing. 

STEP 2 - Click "Add Site" and paste the URL on the pop-up form.