Urging human rights campaigners to use opportunities presented by the Winter Games, Nadia Tolokonnikova said, "you can only press this button once," Radio France Internationale reported Thursday.
"This is a one-off chance," she said.
Tolokonnikova and fellow band member Maria Alekhina were pardoned Monday by Russian President Vladimir Putin near the end of their two-month sentences for "vandalism motivated by religious hatred."
She said Russia had "decided to show humanity" because of a threat the Olympics could be boycotted.
"I think Vladimir Putin feels personally attached to the Olympic Games project," Tolokonnikova said. "It's a question of honor of masculine pride for him. So international pressure concerning the games is important to him."
Tolokonnikova said she and Alekhina will work to expose abuses in Russia's penal system.