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There are two ways to enable Notes and Attachments to Custom Object: 1) When Creating object 2) After Object already been created 1) When Creating object, enable checkbox to Add Notes and Attachments 2) When Object has already been created: Goto Object Page Layout Page Click on Related List Drag and drop Notes and Attachment to related list If you still have any queries please post a comment, would be happy to help you.

I am assuming you already know in Salesforce we can't delete a user,   instead we can deactivate an account so a user can no longer log in to Salesforce. To know more click " Deactivate User ". Now First question anybody would ask is that if we already have "Deactivate users" why would we need Freeze users . So here is the answer, In some cases, you can’t immediately deactivate an account (such as when a user is selected in a custom hierarchy field). To prevent users from logging into your organization while you perform the steps to deactivate them, you can freeze user accounts. Steps to freeze a user account: >  From Setup, click Manage Users | Users. > Click the username of the user whose account you want to freeze. >  Click Freeze. Point to remember: Freezing user accounts doesn’t make their user licenses available for use in your organization. You must deactivate user accounts to make their user licenses available. User Per