The add a new venue form is at the very bottom of the page. Enter 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. Enter these in the relevant fields. This information creates a link that provides fixture location info prior to the match being played. To activate this link you need to update 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. To change the details of an existing venue, click on the relevant venue in the alphabetical list.