Creating an arena is done in the workspace environment. An arena is where you add the website you'd like to analyze along with competitors to view a competitive landscape.
To create your arena:
Add the URL of your site or the primary domain that you wish to analyze, and then click Next.
Add up to four competitors by selecting them from the suggested options or by typing each URL into the Add Competitors field, and then click Next.
Enter your arena name, and then click Take me to my Arena.