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Thank you. I just found them. Now what? Do I save all of them? How do I activate them? Sorry, this is all entirely all new to me. Thanks for answering.

Those are your private keys which are used to sign transactions. Do a google search for public key cryptography.

I think I've got it. Thanks so much for all your help. Big hugs, Tess

Save the private keys somewhere. Maybe print them out to have a backup in case you lose them.

Generally you should use the posting key when logging in. If someone manages to steal your posting key, there's not as much damage they can do with it. The others should be kept and only used when needed. Here's a post with an analogy for how they work:

https://steemit.com/steem/@good-karma/steem-private-keys-analogy-2017525t935606z

Excellent! Now I think I've got it. You all have been a big help. Thanks sooooo much. Greatly appreciated. Big hugs, Tess