Macros are the majority of of it. Once you understand how macros work and how to set them up, you can build a series of macros that work off the same button.

Since you're using a program that has very little customization you will need to use the in game /swapactionbar command to cycle through the macros you set up or /click if that still works.

As far as healing, again, your program is very limited. You will probably need to set up macros that use targeted healing.