transactions

Hello im new on here i had a heart attack and am now back to work but am finding it hard to set up my self employed account on here.  I have linked my business account and can see all my ins and outs

But how do i make the quick book know what each amount is for, at the moment i sell on ebay so i have lots of postage costs, but find myself entering the word postage each time how do i make the system no its postal or sales or what ever with out having to write it in on every transaction, so its actually quick.