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Hello, my name is Curtis, I am a Sharp Customer Servicer Rep. Normally the calculator would have a thin slot on the back, where you would feed the paper through, then once you press the paper in till it hits an inner wall, you would press the feed key which is on the upper left side of the calculator. If there are any problems doing this please call our technical support line at 1-800-237-4277, I am very glad to hear you like the calculator though!!!
Hello, There is no lock button. Calculator may be configured to be in computational mode you are not familiar with: It may be set to do base calculation on base 5, hence the p (pental). Press the reset button on the back, and the default configuraion will be restored. You should give some time to learn the different mode of calculations. Hope it helps.