Making the Address field mandatory when adding a new Account

Hi,

Hopefully an easy one for the experts.  Can you tell me how to make it mandatory for the address fields to be entered when adding a new Dynamics account?

I use two different views but i hope that by making one mandatory the other will be mandatory as well.  I want staff to add new accounts but I am finding that some addresses are missing and I want to stop this happening.  

See attached images of the areas that i am referring to.

Any advice appreciated.

Regards

MrM