Hi Ronhud
If you pull the door seal away you can then prise the trim away, I have some trim removal tools to help with that, but a big flat screwdriver wrapped in tape or rag to protect the sufaces will do.
If you have a look in the gap where the door seal was you'll see clips holding the trim in place ( top and middle) lever the trim there and it sould come away.
re fitting put the trim back and tap back with your fist, to refit the door seal push back in place making sure its not under the trim then tap back in palce with the handle of a scredriver or rubber hammer.
Its easier to move the trim if it's and the aerial will stick on the windscreen better if the car is warm, you need to clean the glass realy well to remove any grease I use medi prep alcohol wipes but neat screen wash will do.
If yor trying to get the DAB aerail to the radio a bit the net curtain wire helps thread it through the dash ..
quicker to do that expelain
I do this lots for work and the Lingo is easy to do Good Luck
Jake