Hi,
Adding new fields in any module based on the Record Browser (and most of them are) is extremely simple:
- login as administrator or superadministrator
- go to Menu-> Administrator
- open Record Sets
- select appropriate record set - for example Company or Contact
- click on Manage Fields tab
- click on New Field
- name the field (this will be a label as well)
- select type
- fill checkboxes: table view means it will be visible when browsing records, required (self explanatory), filter enabled means you can filter by this field when browsing records.
- save it
If you have more specific questions please post it here.