Updating Patient Blood RF factor

I have newly install the OpenEMR module, I m not able update the patient Blood RF factor (Blood Group like A+ve, B+ve, etc.) using the User Guide provided here.
Please help dear developers and friends

Hi @sanzai,

Welcome to the community. Which OpenEMR Module did you install? The User Guide you referenced does not contain a link. I’m not familiar with any modules that have the blood RF factor, though there are easy ways to track that.

Can you provide some details:
What version of OpenEMR are you using?
Do you have any third-party modules installed?