Click Admin (in the lower left portion of your screen), and navigate to the desired account/property/view.
In the Account, Property, or View column (depending upon whether you want to add users at the account, property, or view level), click Access Management.
In the Account permissions list, click +, then click Add users.
In the upper right corner of your account, click the tools icon , then under “Setup,” click Access and security.
Click the plus button .
Select an access level for your invitee, then enter their email address.
Click Send invitation.
After the person accepts your email invitation, you’ll receive a notification in your account. If you need to revoke your invitation, click Revoke in the “Actions” column.
Wordpress
Sign in to your WordPress Admin (yoursite.com/wp-admin).
On the left hand navigation, click Users, and then Add New.