So how do you read QR Codes?
These codes are similar to bar codes. A device scans the code and reads it. First you need to a have phone that is capable of running scan software.
Here is a page that shows makes and models of phones that have readers available.
Once you have downloaded and installed the software, read the instructions and practice using it. Some softwares are easier to use than others. Also, if you can, try several softwares as some work better than others.
So far on my iPhone, the app that seems to work the best is
QuickMark. If you have an iPhone you can just get it from the app store. It is $.99 but is very good. There are some free readers you can also try them without cost.