Our new columns' names do not match the others in the data set. It's best to use consistent column names, so we will change the new names a bit. Let's start by changing EmailName to email_name. We will use the colnames() function. This function returns a vector of names of columns in a data frame, have a look:
colnames(survey)[5] <- c("email_name")
The colnames() function takes a data set as its argument. We use the square brackets notation to access the 5th element (the EmailName column). Finally, we assign it a vector with the new column name.
Change the name of the column FirstName (position 1) to first_name. The data set is survey.
