There is a pdf on the Peerplays website explaining what to do.
http://www.peerplays.com/news/wp-content/uploads/2017/06/Howto-Claim-Your-PPY-Tokens.pdfIf you owned Bitshares on September 2, 2016 at 16:37 UTC then
you only need to read Section 2. I would advise caution though,
as the process involves entering your Bitshares private key to log in and make your claim.
You may want to read the "Security best practices for claiming BTS sharedrop in Peerplays?" thread on this forum.
On another note if you just want to see how many Peerplays are waiting
for you to be re-claimed you can go to
https://peerplaysdb.com/ and
in the search box enter your Bitshares account name prefixed with
"bts-". So if your account name was "bobs_bitshares" you would search
for "bts-bobs_bitshares"
Hope this helps.