Hi mark,

Please be attentive, you're editing the Standard Access. This is designed for Registered Users. The red marked permissions are related to all topics and replies, but not own topics and replies. These are admin and moderator permissions, they can edit/delete other member topics and replies. For the standard access there are duplicated permissions with own word, which indicates own content:

• Can edit Topic (not allowed)
• Can edit own Topic (allowed)

Ok, so you didn't follow me. Have you read all permissions?

 Sorry, I don't understand what you mean.

You have nothing to activate, those are already active and editing is already enabled. Please see the screenshot: