Go to 'Settings' > 'Customization' and select the module you would like to customize e.g. 'Companies' > Select an action e.g. 'Add Field' or edit details to that module.
Click on 'Save' and re-login.
How to Customize Menu and Navigation:
Go to 'Settings' > 'Menu & Navigation' and customize the module name & actions.
Click on 'Save'.
How to Customize Future Commission Rule:
Go to 'Settings' > 'Customization' > 'Add New Rule', add details and click on 'Save'.