Can I present a KA lesson to a group?

I'm not sure how you would go about this. I found this page which might help you with what you want to do:
https://www.khanacademy.org/resources

What I have done in the past is to show the video on my account using a projector, and then do the questions together. Students use whiteboards to solve, and then we choose the answer together. 

OHQ Using Khan Academy to Show a Lesson to a Group....Hi Daniel. I find it hard to show Khan Academy to a whole class group. What looks good from 2 ft away (....like, an individual looking at a monitor....) looks terrible from 8 to 10 ft or more away. For instance, the videos are on a dark background with text written as thin colored lines written on the dark background. This is hard to read and some colors are not readable. The practice problems are better.....light background mostly black text. However, often the text on the practice problems are too small to read from 8 to 10 feet away. To use Khan Academy lessons for the whole class, I use the videos as a model for how to teach a topic, then I walk through the practice problems with the class. Students who cannot read from their seats can sit on the floor in the front of the class. On the other hand, I do find Khan Academy works well in small groups where everyone in the qroup can see the screen on my laptop.