Networks on Zillable are exclusive. You must be invited by the Network Administrator or Owner in order to join. To join a Network, simply click on the Activate Button or click the link provided in the email from the Network Administrator or Owner to join the Network.
Similarly, the network administrator can enable a feature to allow full members of a network to invite new members via the Invite Team Members option. When enabled, this feature will appear as a menu item under the Profile menu.