i would like to transfer audio cassette to cd. i have audacity 2.x ithink and windows 7. can someone tell me the steps to do this?

Please see these tutorials:

Also, you can check the exact version number of Audacity by looking in “Help menu > About Audacity”. The current version is 2.1.1. I you are using a different (older) version, you can get the current version from here:
When updating to Audacity 2.1.1, it is generally best to select the “Reset Preferences” option during the installation.

This new workflow from the draft Manual for the upcoming 2.1.2 may be useful to you too: