Gab has editing! Find your post on either the homepage or your profile and click on the drop down arrow in the upper right hand corner of the post.
Click on “Edit post”
A window will pop up with your original Gab and will allow you to edit your post. Click Publish to save!
If a post has been edited, it will say “edited” next to the timestamp. Click on this link to see the edit history of the post.