Check out these guidelines and best practices.
Select Change Password under your user name (in the top right corner). Passwords are auto-generated by the service, by default. Your subscription may be configured to allow users to define their own passwords. This is a global subscription setting that applies to all users.
Select Home Page under your user name (in the top right corner) to change the first page that appears when you log in.
It's recommended you add a new user account with a Manager or Unit Manager role to begin, although any user role except Contact is fine. If the subscriber account is lost or misplaced, this makes it possible for Support to reset the password for the subscriber account while retaining all saved results and configurations including user accounts.
Go to Users > Setup > Security (Manager only) to set advanced password security settings that apply to all users in the subscription. For example, you can allow users to define their own passwords, set password expiration, and define how many failed login attempts will lock a user's account.
Manage assets - IPs, domains, asset groups, networks, and more
Manage users - users, business units, distribution groups