You can get to the Groups menu in The Hub by clicking "Groups" on the left side-menu:

Below, you can find a number-coded image explaining the different options available there:

Clicking this option will show you the groups that you currently belong to

Clicking this option will bring you to the groups that you have created yourself

Clicking this option will allow you to search for groups of interest to join

4. + Create Group
Clicking this option will allow you to create a group in The Hub. You can find step-by-step instructions in the article here: The Hub: Creating a Group

If you have any questions about this or run into any issues, you can contact Technical Support at support@exprealty.net or in exp.world at https://exp.world/techsupport-agent