New mac book air

I just got a new macbook air. I have a “My Passport” that I use with my time capsule.  I was able to transfer all my files, applications, etc successfully.   I have now used the new computer for a couple of weeks and need to start backing up the files in the new computer.   

I connect the drive and I choose the disk in the time capsule preferences  and it says “preparing for back up”.  It has now been 3 hours and nothing else happens.

How do I get the new computer to start backing up to the Passport.

Thank you.

You may have to format it (Erase it) in case the old backup is in conflict with the new backup.

Regards,

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