I bought neo + second hand cant register it to me why not?

Purchase the correct key and reset it.

First you must connect to WiFi.

Is it working with a card? Can you erase the memory of past operations?

If you have the users manual instructions will be there on how to set it up . There are firms that service and repair cash registers, If it is second hand may be it should be serviced and ask them to set it up for you.

See https://bushnell.registria.com/

bought a sharp xe-a102 can't z it to clear existing figuires

PGMX means the machine is trying to print a current program report. It may have been interrupted. Try this procedure to jump it back out:
Turn key to PROGRAM mode. Turn power off at wall. Hold RECEIPT FEED down - keep your finger on it. Turn power on at wall. Wait 5 seconds, then let go of RECEIPT FEED. You should see "FFFFFFFFFF" on display. Press SUBTOTAL. Turn key back to REG mode (you may need to sign on if asked)
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If anyone needs a manual for a Casio TE-4000F cash register, http://the-checkout-tech.com/manuals/cashregisters/Casio4.php

Would you try this procedure:-
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First on the base station..press and hold paging/register key for 3 seconds
Than on the hand unit select function key and open "MENU"
select "SETTING" from menu and confirm (Ok)
Selecect "HANDSET" and confirm
Than select" REGISTER" and confirm
than enter "0000" as pin and confirm..
it will flash and it detects the base.
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Take care..

Are you going to keep the rest the same?
Logos are done in Program 2
2 subtotal 0132 subtotal enter characters press the CA/TEND or CASH or CA or the lower right hand button press subtotal

ask the original owner to de register the product