QR Code

I am not exactly sure what you are asking, here. If you simply want to change the QR codes in the document so that they can be re-exported and printed, Willi's answer covers that. You can edit any QR code in an InDesign document by selecting it.

If, as I am afraid, you mean change the content of the QR code but not change its actual pattern  —"shape" — so that distributed or printed goods will work correctly, that's not possible. QR codes are widely misunderstood. They are not, as with EAN bar codes and the like, just pointers to information; they are the information. All the data you put in is transformed into the dot patterns, self-contained. If you change the data, the pattern of the code will change.

If you have final or printed material with the flawed codes, they will have to be re-distributed or reprinted. There is no option.

Some pointers, though — if the problems are with accented characters in names and places, the fault is InDesign's vCard/Business Card form generation, which is limited to v2.1 of the vCard standard, which does not support upper-ASCII characters. The only way to generate a v3.0 (or v4.0) vCard code is to use the "Plain Text" mode and compose your own data string. This is a superior method for all forms of QR code generation, and worth learning because it frees you from the limits and the problems of any form-based code generator.

You can find a fairly complete primer on QR codes using InDesign here: http://www.nitrosyncretic.com/DPR/dpr_qrcodes.php

(Do let me know if it does not translate well or if you have any other questions.)

1. Selet the code square
2. Object ~ Generate QR Code
3. Edit the wrong fields