Custom Mail Template - Modlog - NEVER MIND

I have a custom mail template modification (in a separate .nsf) created by a local business partner. I need to apply this mod after upgrading from R5.0.11 to R6.5.1. In the documentation provided by the business partner, mention is made regarding a modification page (modlog) which states that this can be used as a reference for administrators and is only visible from the designer client.

Can anyone direct me as to how to find this document in the designer?

Also, any tips for what I need to do regarding upgrading this customization (applying the mod) after my upgrade to R6.5.1 would be greatly appreciated.

Thanks, Jerry