How do I update or restart/refile my taxes I forgot to claim two dependents and now don't know how to update the files so I can get my proper amount

This is confusing.   Did you already e-file?  You mention wanting to "refile".   If you already e-filed, it is too late to make any changes until you see if the IRS accepts or rejects the return---which will happen when they start processing e-files on January 29 and thereafter.  

Please explain----did you e-file?   Or did you just make a mistake that you want to fix before you e-file?