Sounds like you need to talk to your supervisor and request more training. If that doesn't work, speak with the HR manager. You should have proper training in order to do your job properly, in turn, satisfying the customer.
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As your supervisor or manager for extra training in those areas you are not familiar with.
Ok so I'm a cashier at Wal-Mart and im having trouble with most thing. like don't now how to put money on a gift card. Or how to pay some one utility bill. Or how to check the price on a iteam. Or if someone wanted to pay a certain amount of food stamps how do I do that? I need someone to take me to a step by step process please also how do you change a oringal price a different price? And if a copon dosent scan what do I do? If something says invald or enter bar code what do I do. Sorry for asking so much just need help thanks