I need a program for 6502 that divides a number, that was enter with the keyboard, by 2. And present the result in the I/O window.

Please somebody help me.

How the number is entered and output will depend a lot on the hardware. How it is represented in memory depends on what other software you are using. If the number is represented in memory as a non-negative hexadecimal integer, the job is as simple as using LSR on the high byte, and ROR on subsequent bytes until the entire number is shifted to the right by one bit position. If it's only a two-byte (ie, 16-bit) number, it only requires the two instructions:
Very simple. The remainder from the division is in the carry flag.

This is obviously a homework question. Anyway, a simple solution is to output the number in base 2 (binary) but leave off the last bit (or to be accurate, put a decimal point before the last bit). The teacher might not like it, but it is dividing the number by two.

Meaning, redefine the format. Teachers generally don't like like "solutions" that involve redefining things

Obviously, Juan, your question is not specific enough.

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I trust my somewhat flawed English is comprehensible to all.