If you are travelling between Wrexham and Marford, then get off as normal :)
If you are travelling between Rossett and Rough Hill you should remain on the bus (that will be travelling down the bypass from junction 7) until the Chester Business Park, ring the bell, get off and then catch a bus that’s going to Wrexham, this will then take you through Pulford and Rossett way :)
Self explanatory :)