Currently only workspace admins and owners can add or remove members from a teamspace.
After a teamspace has been created, you may want to go back and add additional members to it. To do so, follow these quick steps.
1. Enter your teamspace
Your teamspaces live in the lefthand dashboard menu, and can be accessed by clicking on a teamspace's name.
2. Click "Invite"
Toward the right of the screen, above the purple upload button, is a button labeled Invite.
3. Type in your teammates' emails
On the following pop-up, you'll be able to enter the emails of any teammates you wish to invite to the teamspace. Once done with entering an email, press the enter key to render it as an invite. If you mistype an email, just click the X next to the entry to remove it. You can invite as many or as few teammates as you'd like. When done, click Add members.
All invited teammates will receive an email that will allow them to hop into the teamspace.