Hello, Dear Yashang!

To hide these icons, click WP Dashboard => Appearance => Customize => Additional CSS and insert here this code:

.fa-shopping-basket:before {
    content: "\f291";
    display: none;
}
.fa-user:before {
    content: "\f007";
    display: none;
}

Then save changes and check result at front-end.

To change Departments title, open in code editor file class-fw-extension-departments.php which locates in /wp-content/plugins/mwt-unyson-extensions/extensions/departments/ and go approximately to the line # 191. Change here 'plural'   => __( 'Departments', 'fw' ) to 'plural'   => __( 'MyCustomName', 'fw' ) and save changes. Then check result at front-end.

To rename any department, click WP Dashboard => Departments => select appropriate departments and change title and permalink like on the this screenshot: http://nimb.ws/Ko5VaN Save changes and check result at front=-end.

Best Regards!