Wordpress Theme -> Custom Nav Menu -

I am very new to creating WordPress topics, and I need some help with the navigation menu, something like the navigation bar Should be:

  & lt; Ul id = "nav" & gt; & Lt; Li class = "top" & gt; & Lt; A href = "# home" category = "top_link" & gt; & Lt; Span & gt; Home & lt; / Span & gt; & Lt; / A & gt; & Lt; / Li & gt; & Lt; Li class = "top" & gt; & Lt; A href = "# page1" class = "top_link" & gt; & Lt; Span & gt; My page & lt; / Span & gt; & Lt; / A & gt; & Lt; Ul class = "sub" & gt; & Lt; Li & gt; & Lt; A href = "# page1_1" & gt; My pages _ 1 & lt; / A & gt; & Lt; / Li & gt; & Lt; Li & gt; & Lt; A href = "# page1_2" & gt; My Page _ 2 & lt; / A & gt; & Lt; / Li & gt; & Lt; Li & gt; & Lt; A href = "# page1_3" & gt; My Page _ 3 & lt; / A & gt; & Lt; / Li & gt; & Lt; Li & gt; & Lt; A href = "# page 1_4" & gt; My Page _ 4 & lt; / A & gt; & Lt; Ul & gt; & Lt; Li & gt; & Lt; A href = "# page 1_4_1" & gt; My Page _ 4 _ 1 & lt; / A & gt; & Lt; / Li & gt; & Lt; Li & gt; & Lt; A href = "# page 1_4_2" & gt; My Page _ 4 _ 2 & lt; / A & gt; & Lt; / Li & gt; & Lt; Li & gt; & Lt; A href = "# page 1_4_3" & gt; My pages _ 4 _ 3 & lt; / A & gt; & Lt; / Li & gt; & Lt; / Ul & gt; & Lt; / Li & gt; & Lt; / Ul & gt; & Lt; / Li & gt; & Lt; Li class = "top" & gt; & Lt; A href = "# page2" class = "top_link" & gt; & Lt; Span & gt; Second page & lt; / Span & gt; & Lt; / A & gt; & Lt; Ul class = "sub" & gt; & Lt; Li & gt; & Lt; A href = "# page 2_1" & gt; Second page _ 1 & lt; / A & gt; & Lt; / Li & gt; & Lt; Li & gt; & Lt; A href = "# page 2_2" & gt; Second page _ 2 & lt; / A & gt; & Lt; / Li & gt; & Lt; Li & gt; & Lt; A href = "# page 2_3" & gt; Second page _ 3 & lt; / A & gt; & Lt; / Li & gt; & Lt; / Ul & gt; & Lt; / Li & gt; & Lt; Li class = "top" & gt; & Lt; A href = "# apage" class = "top_link" & gt; & Lt; Span & gt; Other pages & lt; / Span & gt; & Lt; / A & gt; & Lt; / Li & gt; & Lt; Li class = "top" & gt; & Lt; A href = "# xpage" square = "top_ink"> gt; Page & lt; Span & gt; & Lt; / Ul & gt;  

And I'm sure you can tell how pages should go.

You can try the plugin to do this. Its beautiful configuration.