Menu options missing

Hi

I am using “The Retailer” e-commerce theme.
While creating menus or editing the old menus, I can’t find some of the options in Pages section of the panel, though I have searched in All.
Few those options are “Shop” or “My account” etc.

Also, there was one default menu in theme, namely “My account navigation”, but while viewing the site when user clicks on “My Account” menu it shows an error 404 every time.

I have tried activating de-activating the plugins and theme but its not working.

My site is http://www.mazeltoe.com.

Please look into this and suggest me some solution asap.

Thanks.