You have to wait until the judge agrees the lawsuit should be a class action. If he does, the attorney(s) will make an announcement at the appropriate time informing the public who is part of it.
Lawsuits are incredibly expensive. The group has to find an ambulance chaser who is willing to work on a contingency fee arrangement.
Look around for someone redpilled with charisma and leadership qualities. That person can help draw people together. This is not something one can fight alone.