Hello GamerGirl19.
For the password, you need to go to the different math equations and solve each one. Once that's done, they need to be put in order. So, for example, if there's a blue colored equation you would go and look at the door to see where the blue square is and that would be where that number would go. The equation answers aren't added together or anything. It's just the equation answers, in the order of the colors of the blocks on the door.
If you're still not able to continue on, let me know and I'll give you the password. Also, if you'd prefer, there is an option to skip ahead using Enter.