Go to the "LinkedIn Accounts" page (this is the first page you see when you log in to https://app.inlytics.io/), then press "create Group/ invite people" on the top of the page. Choose the option "Create Group" to continue.
Next, you will see an input mask where you can name your Group. Also, you can add a logo to your Group and define the Group purpose. In the next step, you will be asked to invite users to this group by sending them an email invitation (learn more about the Roles down below). After the completion of this step, your Group will be created.
Remember: You have to be on the business plan to see that option.