Unfortunately it's not possible, because ea turned the servers off.
Madden 15. 16, 17, 18, and 19 are all off.
If I was you, if your looking for CLASSIC ROSTERS made by Percussions and Soundwave, I highly suggest you go to your NEAREST gamestop or local video game store and purchase a copy of MADDEN NFL 20, you can not purchase madden 20 digitally anymore, they stop that to. So unless you had it digitally your only option is in store, or online ebay etc hard copy.
Get on there and download EVERYTHING before they turn those off as well.
And tbh that had the best rosters period through all those games.
1985 - 2015
With Draft classes and custom playbooks