I am trying to connect a wireless number keypad to my iMac and it won't let me

Contact the manufacturer of the third-party device for assistance.

Barry

Hi culvert,

It is not clear whether or not you are using the Apple Magic Trackpad, but if you are, I would suggest that you use the steps in the following article to help troubleshoot -

Troubleshooting wireless mouse and keyboard issues

http://support.apple.com/kb/TS3048

While the article’s title says it is for keyboard and mouse issues, the same steps apply to the Apple Magic Trackpad.

Thanks for using Apple Support Communities.

Best,

Brett L