How do I enable editing the body of a block? I have a block (in Drupal 7) with information in the body of it. 

I want a specific user to be able to edit that information. 

After assigning that user Administer blocks and Contextual links permissions the user can edit everything except the body and the following message shows: 



Is there any way to enable the field for that user?
You are facing this issue because you probably created the block as a user who has access to a text format like Full HTML but the other user doesn't have that permission :( Here's what you can do:


Sign in as the root user (uid 1) who created the block;
Change the text format to Basic HTML or Restricted HTML.
Go to Admin > People > Permissions page and make sure the other non-admin user has the permissions to use the text format you applied.
Depending on your requirements, you can ignore point 2 and give Full HTML permissions to the concerned user.