ssd1306 Include Question

Greetings,

Have been using Richard's include for the SSD1306 (32*128) display with sucess.
I was now trying to display a single dot which would move on the display according to an X and Y coordinate variable.

Using the command GLCDDHL 0,0,1,1 works to display a single dot and for a fixed X and Y value but not if I want to use something like Xvar and Yvar.

How can I do this?

Thanks