First enter Edit mode. Go to the Share tab of the Project Build Form and click the plus button to invite a Producer or Project Member. A dialogue box will appear where you can enter the email address of the person you would like to invite. Enter an email address, subject and welcome message. Then click the "Send Invitation" button. If your project is a Discussion Project, you will also find a share link. You may copy the link to your clipboard and share the link using your own email or social media accounts.
To invite a client, you must create a Client Project or save your Project as a Client Project if it is currently a Discussion Project. Then navigate to the Info tab. The plus buttons for clients are located there.
Anyone who is invited will receive an "autolink" to your Project. If they are already subscribed to Lifester, the autolink will take them directly to the Project without any interruption. If they are not a Lifester user, they will still be taken directly to the Project; the Project will appear grayed out until they enter their email and choose a password (or join using Google with one click); then the Project will appear. (The default account is free.)