Customizing Accounts, Contacts, or Activities
You can customize each of the standard tabs and types of records, including adding custom fields and setting page layouts. You can also customize search, tagging, and user interface options for your organization.
To customize: Accounts, Contacts, OR Activites in the system
Accounts
Under App Setup
Select Customize
Then click
~ Accounts
Customize the standard picklists, create custom fields and custom links, control the layout of fields, related lists, and custom links, and for Enterprise, Unlimited, and Developer Edition organizations, create record types and set up account teams.
Contacts
Activites ~ Events, Tasks, Calendars
Under App Setup
Select Customize
Then click
~ Activities
*~ Events
* ~ Tasks
Customize various options for tasks and events such as fields, page layouts, record types, validation rules, search layouts, and buttons. Also, enable or disable functionality like activity reminder popups and recurring events.
See Force.com's Documentation
Dev/Trial Users: Customizing Activity Settings
Active Users: Customizing Activity Settings
Additional Details:
See Force.com's Documentation
Dev/Trial Users: Customizing Fields
Active Users: Customizing Fields
See Force.com's Documentation
Dev/Trial Users: Customizing Page Layouts with the Original Page Layout Editor
Active Users: Customizing Page Layouts with the Original Page Layout Editor
OR
Dev/Trial Users: Customizing Page Layouts with the Enhanced Page Layout Editor
Active Users: Customizing Page Layouts with the Enhanced Page Layout Editor
Or
Dev/Trial Users: Setting Page Layouts and Field-Level Security
Active Users: Setting Page Layouts and Field-Level Security
See Force.com's Documentation
Dev/Trial Users: Viewing and Editing Record Types
Active Users: Viewing and Editing Record Types
See Force.com's Documentation
Dev/Trial Users: Setting Custom Buttons and Links
Active Users: Setting Custom Buttons and Links