After creating a team you can always add more users to your team in addition to those you first invited when you created the team. There are two ways you can add more members to your team.
Adding team members on the homepage:
Once you have created a team, the team the 'Create a team' button will change to 'Manage team'. Click this button to be directed to the team account page where you can add more team members.
Adding team members from 'My Profile'
You can also add more team members by going to the profile avatar. From the 'My Profile' dropdown menu, click on the name of the team you created that you want to add more members to
When you have switched to the relevant team's workspace, go back to the 'My profile? dropdown menu, and click on 'Manage team' in the menu to be taken to the team account page where you will be able to add more team members.
On the team's accounts page, click the 'Add Team Member' button and enter the email ID of the users in the text box. Click 'Send invite' when you are done.
After an invite has been sent to a team member, before they accept the invite, their status will be denoted by the pending icon as seen below.
Once a user has accepted the invitation to join your team on their end, the pending icon will be changed to active as seen below.
And that's how easy it is add team members and manage the team!