What information does 1Password store about a login I create on or import into 1 Password?

Hi @james1964!

Question: In 1P, can I add in my own comments about this shopping site login I have created in1P, and if so, how do I do this? I have been unable to do this so far.

Yes, you can use the Notes field which you find at the bottom of every Login item:

Alternatively, you can also create custom sections and fields to enter this information, if you prefer:

https://support.1password.com/custom-fields/

Question: If I export my LastPass information (including these comments of mine) on another shopping site to 1P, will 1P import my own comments about that site, such as hat size, belt size, and extent to which my orders have arrived on time, or been delayed or damaged?

Yes, you can import this data from LastPass:

https://support.1password.com/import-lastpass/

Question: If 1P does make this import, how and where can I see these comments and change them later if necessary?

By Editing that Login item, you can edit any field inside it, including the Notes :+1:

https://support.1password.com/getting-started-windows/#create-and-edit-items