I asked a supervisor of my good friend's company to introduce me to work. At first, he asked, but didn't answer. How should I text him?

If you really want to beg him, don't be subtle. You may not know how to say it. Call! Your mouth is much better than a cold text message. Just ask him how he got here. If he doesn't understand your intention, tell him that his company is a mess or something. Tell him he wants to change jobs. If he doesn't know this friend, I don't know how they can be the main manager. That he doesn't want to help you at all. You also said he agreed to help you find it. Have you forgotten that if the relationship is really good, invite him to dinner for tens of dollars?