My new Seagate Time Machine arrived but despite me setting up a password several times, nothing is happening. Do you have some basic instructions?
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Instructions differ based on which Operating system you're using. Go to the Apple in the top left corner of your screen and choose “about this Mac”. It will either say Big Sur, Monterey, Ventura, Sonoma.

For Sonoma, Open System Settings, select General then to the left, select Time Machine.



Next, select "Add Backup Disk". With all other drives you may be using, disconnected, select the new drive you just purchased. Once it's selected, you may be prompted to "erase" the drive. That is totally normal since you most likely just purchased it so there would be noting on that drive yet anyway. Once you've gone through that step, you should be good to go.

Note: If you are asked to use an Encrypted backup, say No. I do not recommend people use that option.