CompuServe Messages

The code works, but I'd like to change it from subscript-based to pointer-based addressing eliminating the [i]'s. I've tried several ways, but I don't get the hang of it. I'm just learning pointer processing and don't know how to use the pointer addressing to address the i'th occurrence of my array (if there is a way, which I'm pretty sure there is…) Thanks for taking a look at this for me.