Ah, good question. They cannot be used *normally* directly in BASIC program. You need to actually create a separate program and then call it in a BASIC program using Asm(prgmPROGRAM
Here is a little demo for inputting codes:
However, if you want to experiment a little (back up or archive your proggies, first!) you can combine opcodes, but you need to drop the "C9" for it to work. So, say you want to turn off the LCD, turn off the run indicator, clear the LCD and then turn the screen back on, you can do:
3E02D310
EF7045
EF4045
3E03D310
C9