How do I set up my WD Passport a 2nd time

On my iMAC Maverick OS, I hooked up my Passport ultra the first time, and just copied my Hard Drive to it. The second time I plugged it it a menu appeared suggesting different back-up options; once a day, once a week, etc.  After traveling across the country I plugged it in again, and all it shows is that the last back-up was done on Sept. 21. I can’t figure out how to set up a scedule, or even how to do a back-up.

Time machine from system preferences on your mac.

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When I do this, all it does is open up about 15 identical windows that do nothing.  Any other suggested would be welcome.