When you have defined your system connections you can activate
a connection using Signon in the Explorer menu.
Before you begin
Before connecting to a system, you must have at least one
connection configured. The Signon option connects to the system name
shown in the connection status bar, which is in the lower right corner
of the workbench

. If the system
name to which you want to connect is not showing in the connection
status bar, click the system name in the connection status bar to
open the Preferences Connection view, then select the connection to
which you want to connect. To configure a connection, see
Configuring a system connection.
Procedure
Click File > Signon from the workbench menu bar.
What to do next
When
Signon is clicked
z/OS® Explorer attempts
to connect to the system indicated in the system connection status
bar. If you did not previously enter your password or pass phrase,
you are asked to enter it now.
If the connection is successful,
the connection name appears in the connection status bar, which is
in the lower right corner of the workbench. The connection status
icon is green for a non-SSL connection , or a padlock icon for a SSL
connection.
If the connection is not successful, the connection
name appears in the connection status bar, which is in the lower right
corner of the workbench. The connection status icon is red, indicating
that the connection was not successful. An error message is displayed
providing a reason for the failure. Check the values in the fields,
correct any errors in the connection definition , and click Connect to
test the corrections.