You do not have to
do anything until you have received your refund, doing anything now will delay
your refund. Once you have received your refund, you can amend your 2015
tax return. But don't worry, you generally have 3 years to amend your taxes,
unless you will owe, then it would be best to do it as soon as possible after
getting your refund, to avoid penalties and interest. See FAQ below for more
info and how to file for 2015.
https://ttlc.intuit.com/replies/3288565