Question: I'm having difficulty trying to add a team to the site. If I click on group and become a member it does not give me the option of adding a team under that group. 

Hi - Thanks for writing - on Walker Tracker groups are essentially teams.
A group can challenge other groups to a competition for example, and on competition maps they show up as teams.

If you want to create a team - create a group. Then when you go to the competition page you'll see under "Who versus who" you can challenge other groups/teams from your group.

Note that only the group's administrators can challenge other groups or accept competitions.