Can’t complete a quest

I just bought this game a little bit ago and i’m currently doing the gain new allies quest. I’m at the part where i need to put the fuck the conformists sign at the pta meeting. however when i went to put the sign going up to the podium triggered a conversation with randy about learning the sneaky squeaker. after the conversation i lost my sign and can’t put it up anymore ????? i dont have checkpoints before the conversation with him so i cant go back 😞😞😞