You have a choice ...

1. You could post a link to the flyer and website of Christian Climate Action Bristol - though looking at their Facebook Group at https://www.facebook.com/profile.php?id=100066404681153 I see more a history of events they have supported and no  sales pitch for 27th September

2. Click "Additional Options" which you'll find directly below the window into which you type or paste your contributions, and you'll be offered "Attach / Choose file" which will let you upload an image, or a .pdf, from your local computer / phone - you will need to have saved a copy locally first

3. If a picture of the flyer is available elsewhere on the web - either on another site, or on your own web space - you can include it within your one post within [ img ] to [ /img ] tags.   A picture of s flyer,  provided that you also add a link back to the organiser in some way (that's usually on the flyer anyway) is usually acceptable as their purpose at putting the flyer out is to get the widest possible exposure - however you need to be aware of copyright laws and make very sure that you're not sharing a picture that someone else owns and could get upset about you sharing.

 
Christian Climate Action Bristol and region - Three Ports Pilgrimage - Saturday 27th September

Join us to pray for transport systems, climate and nature on a six mile walk from Portway Park & Ride, via Portbury Docks, to Portishead.
You don't have to be a Christian, or in any way religious, to join us. The "prayers" will help us to think about how human beings have interacted with the environment.
Meet at Bristol Temple Meads at 9.30 am, or at Portway Park & Ride at 10 am.
Return from Portishead to Bristol by Badger Line bus X4.
There will be options for a shorter walk, and also an opportunity for a picnic lunch, and there's a coffee shop at the end!
If you'd like to join us, or if you have any questions, please email:
christianclimateactionbristol@gmail.com

Can any one advise how to post a picture of the flyer.