This page allows you to change details of an existing venue. You can change the venue's name as well as the grid coordinates and scale from the MultiMap service. As you click on the maps at Multimap, the X and Y coordinates are shown in the blue box below the map and the scale is shown in a drop-down box on the left. As with adding a venue, this information creates a link that provides fixture location info prior to the match being played, but you need to activate this link by updating the relevant fixture on the add/change fixture page. You don't need to change any details. just select the fixture in question and click the update button.