The pool can be set up for multiple eliminations. You have a few options:

1- Issue mulligans manually. This option is found in commissioner console --> Issue Mulligans --> select week/players --> revive

2- You can turn on your automatic mulligans. This option is found in commissioner console --> Pool Settings --> Mulligan Settings. Turn it on and select a maximum of "x" amount of mulligans. This will revive your members that many times before eliminating them.