Ability to mandate ‘phone Number’ and ‘email’ in the supplier site ?

Summary:

Ability to mandate ‘phone Number’ and ‘email’ in the supplier site ?

Content (please ensure you mask any confidential information):

Hello

I was wondering if you can please let me know how to setup a Sanbox to make 2 fields mandatory on the Supplier Contacts

Thanks

Version (include the version you are using, if applicable):

R13

Code Snippet (add any code snippets that support your topic, if applicable):