My name is ***** ***** I'm going to attempt to help you connect your MacBook Pro to the projector. Typically, as soon as you plug in, it would connect, but I've seen cases like this.
Can you try the following? Go into the Apple menu in the top left of your computer and select "System Preferences". Please let me know when you are there or let me know if you aren't seeing that.
Once you are in there, you can select the "Displays" icon, then click "Detect Displays". Again, if you have any trouble finding any of this, please let me know.
If this did not help, I have another idea; I'll await your status.