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I'm guessing that for both questions, you are using the command-line interface.

First question: type "q". If you type "help()" from the "sage:" prompt, you'll get a message including this paragraph:

(When you type something like "matrix_plot?", "help(matrix_plot)", or "matrix_plot??", Sage may start a paging program to display the requested message. Type a space to scroll to the next page, type "h" to get help on the paging program, and type "q" to quit it and return to the "sage:" prompt.)

(If you're using the notebook instead, just go to the next cell.)

Second question: are you typing the dots "..."? Don't do that. Make sure that the spacing is exactly as displayed in the tutorial.

sage: class Evens(list):
...       def __init__(self, n):
...           self.n = n
...           list.__init__(self, range(2, n+1, 2))
...       def __repr__(self):
...           return "Even positive numbers up to n."
...

When I'm using Sage, after I type the first line, the cursor is already in the right place to type the second line, and the same after the second line. After the fourth line "list.__init__(...)", you will need to hit the backspace key 4 times to get to the right indentation level.

(If you're using the notebook instead, type this in one cell in your worksheet:

class Evens(list):
    def __init__(self, n):
        self.n = n
        list.__init__(self, range(2, n+1, 2))
    def __repr__(self):
        return "Even positive numbers up to n."

Don't type "sage:" and don't type the dots "...".)