how can I make lined pages in pages

Well I just spent some time searching for that and found one round-about way:

Open a document and choose Table in the toolbar.

Open Inspector and choose Table.

The default on mine was 3 rows and 3 columns - I changed that to fill up the page with horizontal lines and chose 1 column in the page width.

That resulted in this (partial screenshot):

That may not be what you wanted, but it's the only thing I found.

FWIW, why do you need lines in a word processing app?

There is a line tool in Shapes.

option shift drag out copies and then use Arrange to distribute them evenly.

When you have them right, group and lock them or send them to Master Objects,

Peter

Ahh, I understand. Well, this should work for you then...... good luck!