Problems in customizing Memoir page size [closed]

I have followed the suggestions proposed in:

Customizing Page Size in Memoir

to customize Memoir page size, and although the page size changes, the text block doesn't fit the page. It seems that the text keeps fixed in the A4 format.

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closed as too localized by egreg, Torbjørn T., Heiko Oberdiek, Stefan Kottwitz♦Jun 1 '13 at 23:31

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Welcome to TeX.sx! Please add a minimal working example (MWE) that illustrates your problem. It will be much easier for us to reproduce your situation and find out what the issue is when we see compilable code, starting with \documentclass{...} and ending with \end{document}. –  Jubobs Mar 24 '13 at 15:14
The text block does not automatically adjust it self after which paper size is chosen. –  daleif Mar 24 '13 at 15:35