Enabling comments when using the tru Theme requires just a couple steps.
First, you must ensure that comments are enabled in Genesis.
To enable comments in Genesis first go to your WordPress Dashboard and navigate to your Genesis > Settings panel. Scroll down to the Comments and Trackbacks section and check Enable Comments on Posts and/or on Pages is checked. Finally click Save Changes.
Next, you’ll need to ensure that comments are enabled in WordPress. Simply go to your General > Discussion panel, ensure the box next to Allow people to post comments on new articles is checked, and click Save Changes. Once comments are enabled in Genesis and in WordPress then all future posts will have comments enabled by default.
Finally you’ll have to take actions on the already published Posts and Pages. Since each of those Posts or Pages had comments disabled when they were written you will need to manually enable them. Full details here.