There is an example code in the zip file, you can use it as a starting point and experiment.
You can also read the arduino link tutorial , I don't have any other resources.
Note that if you try to simulate the result in proteus you may see wrong data in the screen because the screen model is not operating properly.
I haven't done anything similar and there is no such function in the library so the only way I can think of is to rewrite the data is shifted coordinates but you are probably going to see flickering.
All it does is receive a pointer to an array of char and loop all the array members.
Code C - [expand]
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while(*str !=0)// this is true until the pointer reaches the end of the array and finds a null character if(*str =='\n')// this is true is there is a new line character so the function uses ks0108GotoXY to change line
ks0108PutChar(*str);// this shows the character at the pointer position by calling the function that displays a char
str++// and this moves the pointer address to the next char of the array