I need help finding the Ins.Co subscriber number on form 1095-B

When you get to the question did you have any of these types of coverage you should answer No, if you did not have insurance from the Marketplace and receive a 1095-A you

Your 1095 B is NOT entered anywhere on your tax return so you do not need this for your taxes. This is for your records only.  Only a 1095-A is to be entered.  If you are having trouble finding the subscriber number for another reason you can either look at your insurance card or call your insurance company and they would be able to help you, it will likely be your SSN. 

Where is the subscriber number

Your 1095 B OR C  is NOT entered anywhere on your tax return so you do not need this for your taxes.