Swirl Activity : Manipulate function and viewing formulas

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I'm trying to learn R on the swirl package "Least Squares Estimation" and am having two problems.

1) It mentioned using the manipulate function but when I've tried to use it, it says that it can't find the function.

2) In this lesson, I've had to plot regression lines and there are parts where it wants me to view the formulas for the slope of the regression line.

However, I a having difficulty doing this. I believe it said earlier that I can access it by clicking on the gear function on the upper left of graph but it is not appearing.

Thanks

rswirlmanipulate
Was it a custom function in the lesson. Can only find it in issues here. Checking here shows that you have to install a package called manipulate. So first install.packages("manipulate")? – NelsonGon
Try to read this post (stackoverflow.com/a/5963610/882102) on how to ask good questions, and then edit your question with the data and the code that is misbehaving. – MrGumble