Your account number is assigned by the credit card provider and it is usually embossed and encoded along the middle of your credit card
Access credit card is the old name for Mastercard.
ATM means Automated Teller Machines, in othere words hole in the wall cash machines. The cash machines allow access to cash from a credit card once you have entered your personal identification number into the machine.
Some machines will charge you for the service, your credit card company may charge you for this service and you may have to pay a higher interest rate on receiving cash form the ATM machine.
APR means Annual Percentage Rate. This is the amount you will be expected to pay, should you borrow on your credit card. The APR is a figure designed to give credit card holders an idea of the cost of borrowing from the credit card.