Currently, newly registered users are shown Wikipedia's welcome message (MediaWiki:Welcomecreation), including general rules, only once. When the user navigates away, the message is lost. Based on the discussion at Wikipedia:Village_pump_(proposals)#MediaWiki:Welcomecreation_-.3E_Welcome_notice, there is consensus that this functionality should be changed, as currently the welcome message likely goes unnoticed by most users, since it so easy to inadvertently remove it from view permanently.
The message should instead become a box that appears when the user views their talk page; It should NOT, however, be an actual talk page posting; ie. the welcome message should not actually cause creation of the talk page, and links to the new user's talk page should remain red. The message should be dynamically hideable via a "dismiss this message" link. The message should be placed either below the talk page's main header (its title), or in the sitenotice location; whichever seems more technically and aesthetically feasible.
Some technical changes the proposer foresaw in the discussion are as follows:
a) turn off MediaWiki:Welcomecreation
b) create MediaWiki:Welcomecreation2 as the new welcome message, to be shown to new users at the top of their user talk page until they dismiss the message
c) turn MediaWiki:Welcomecreation2 on
Thanks! Please post any questions if further clarification is required.