How to Create/Change Coverletter in MSDS

Hi Expert,

Please guide me how to create/change coverletter in MSDS.

I have already created coverletter but i need guidance from where system get this data.

As selected part shown in above image, In this we want to know from where and which data coverletter pulls from the system.

I know that this will be print some address but from where this coverletter gets that address.

If we want to change that address then from where we go to change the address.

Please guide me on this.

Regards

Niranjan