The clue is in DCC Ready, which means they are ready for you to plug in a DCC decoder to make them DCC Fitted - then they will work with your Select.
A decoder out of the factory has a default address of 3 so you have to give each loco some other address In order to be able to control each one individually.
You should be aware that the Terrier needs a Hornby 6 pin decoder with a harness as there is no room for a direct fit 6-pin decoder. The J15 as far as I know needs a standard 8-pin decoder.
Until you have fitted decoders it is not recommended to even place a DC loco on a DCC track else you run the risk of burning the motor out.