No one can tell you what you're doing wrong, if anything, unless you tell them exactly
what it is you're doing. And what error messages are you getting? Assuming you have first successfully installed the adobe-release-i386-1.0-1.noarch.rpm package using the wiki instructions you linked to, the second instruction to import the gpg key is,
su -c 'rpm --import /etc/pki/rpm-gpg/RPM-GPG-KEY-adobe-linux'
Did you enter that command exactly as shown, including the single quotes and upper case letters where shown? The "su -c" part assumes you are not already root.
It may just be that the adobe repo is not enabled
by default. If I recall correctly, I think it isn't. To check that, do:
cat /etc/yum.repos.d/adobe-linux-i386.repo | grep enabled
If you get back enabled=0
then edit that file, as root, and change that to enabled=1