Change the text on the message which is displayed after the user registration
Goto Admin -&gt; Configuration -&gt; Account Setting -&gt; Change the messages.
OR
You can implement through Rules module.

Send mail after creating new user a/c

Usage :

Goto Admin -&gt; Configuration -&gt; Rule

Click on 'Add new  rule'

Enter Name &amp; Select React on event : After Saving a new user a/c &amp; SAVE

Click on Add Condition &amp; select Send Mail.

Click on Data Selector button &amp; Enter Data Selector : account:mail

Enter Subject &amp; Message &amp; Save