Basic questions about HP-41c

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I don't have any accessory so I can't help much, but if you don't have the manuals, you can find most if not all of them here:

https://literature.hpcalc.org/

To assign a user key programmatically, use PASN instead of ASN (pg 166, in the Owner's Manual vol II):

• put the label name of the user function into the alpha register
• put the key code into X (those are the same codes as ASN, so a 2-digit number <row><column>, for ex 11 for A, 12 for B, ...)
• XEQ PASN