You don't have to enjoin the suit. No lawyer is required in a class action. If you bought your stock during the class period, you are automatically enjoined and considered a plaintiff.
Your only responsibility is to know about it and to make sure you get the required documents at such time as the money derived from the suit is distributed. Your broker can do that for you, most do it automatically as policy and notifty the appropriate parties that you once owned the stock or still do. They in turn will send you a letter explaining what and when and where you should apply for the distribution.
It is too late to be picked to represent the class, all that has been long completed so in effect, everyone buying stock during the class period has only to wait for trial to be over, and the amount of money collected less legal and other expenses is ready for distribution, and that is not likely to happen for a long time yet.