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.
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.