Once you get your ammonia, you'll need to add between 3 and 4 mls of it to your tank; if you pop into a chemist, they should be able to sell you a 5ml syringe (not with a needle, obviously!), just tell them it's for measuring fish medicine accurately
Then do an ammonia test to see what the level is like; you want to be aiming for between 2 and 3 ppm
It will take a week or two for the ammonia to start dropping, so don't bother testing for the first few days.
Once the ammonia starts to drop, add some more to bring the level back up to 2 or 3 ppm and start testing for nitrite as well as ammonia.
Carry on adding and testing until both ammonia and nitrite are reading zero, twelve hours after adding the ammonia.
Then do an ammonia test to see what the level is like; you want to be aiming for between 2 and 3 ppm
It will take a week or two for the ammonia to start dropping, so don't bother testing for the first few days.
Once the ammonia starts to drop, add some more to bring the level back up to 2 or 3 ppm and start testing for nitrite as well as ammonia.
Carry on adding and testing until both ammonia and nitrite are reading zero, twelve hours after adding the ammonia.