Problem

Donnamessina Said:

"Problem: my apple iMac account is disabled so I can’t download or update any apps!"

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Which Account?

Is it your Apple ID? Or is it you User Account on your iMac that you are having issues with? By your wording, I assume it is your User Account on your iMac:

If your iMac's User Account, Go Here:

• Change or Reset the Password of a macOS User Account - Apple Support
• Reset your Mac login password - Apple Support

But, if your Apple ID:

Contact Apple Phone Support:

• Contact Us - Choose Locations
• U.S. (800)MY-APPLE
• Proceed from there as Necessary

Have a look at > If your Apple ID is locked or disabled - Apple Support